Investments Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified
|
Mar. 31, 2014
|
Dec. 31, 2013
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
$ 1,207
|
$ 709
|
Marketable securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
1,089
|
580
|
Marketable securities | U.S. government and agency debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
354
|
354
|
Marketable securities | Mortgage and asset-backed debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
77
|
75
|
Marketable securities | Corporate debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
654
|
146
|
Marketable securities | Other debt and equity securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
4
|
5
|
Other Long-term Investments
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
118
|
129
|
Fair Value, Inputs, Level 1
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
373
|
372
|
Fair Value, Inputs, Level 1 | Marketable securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
354
|
353
|
Fair Value, Inputs, Level 1 | Marketable securities | U.S. government and agency debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
354
|
353
|
Fair Value, Inputs, Level 1 | Marketable securities | Mortgage and asset-backed debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
0
|
0
|
Fair Value, Inputs, Level 1 | Marketable securities | Corporate debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
0
|
0
|
Fair Value, Inputs, Level 1 | Marketable securities | Other debt and equity securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
0
|
0
|
Fair Value, Inputs, Level 1 | Other Long-term Investments
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
19
|
19
|
Fair Value, Inputs, Level 2
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
735
|
227
|
Fair Value, Inputs, Level 2 | Marketable securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
735
|
227
|
Fair Value, Inputs, Level 2 | Marketable securities | U.S. government and agency debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
0
|
1
|
Fair Value, Inputs, Level 2 | Marketable securities | Mortgage and asset-backed debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
77
|
75
|
Fair Value, Inputs, Level 2 | Marketable securities | Corporate debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
654
|
146
|
Fair Value, Inputs, Level 2 | Marketable securities | Other debt and equity securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
4
|
5
|
Fair Value, Inputs, Level 2 | Other Long-term Investments
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
0
|
0
|
Fair Value, Inputs, Level 3
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
99
|
110
|
Fair Value, Inputs, Level 3 | Marketable securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
0
|
0
|
Fair Value, Inputs, Level 3 | Marketable securities | U.S. government and agency debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
0
|
0
|
Fair Value, Inputs, Level 3 | Marketable securities | Mortgage and asset-backed debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
0
|
0
|
Fair Value, Inputs, Level 3 | Marketable securities | Corporate debt securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
0
|
0
|
Fair Value, Inputs, Level 3 | Marketable securities | Other debt and equity securities
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
0
|
0
|
Fair Value, Inputs, Level 3 | Other Long-term Investments
|
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
Investments |
$ 99
|
$ 110
|