Annual report pursuant to Section 13 and 15(d)

CASH AND INVESTMENTS - Summary of Marketable Securities (Detail)

v2.4.0.6
CASH AND INVESTMENTS - Summary of Marketable Securities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Cost $ 587  
Current marketable securities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 587 1,232
Unrealized Gains 10 12
Unrealized Losses 0 (3)
Estimated Fair Value 597 1,241
Current marketable securities | U.S. government and agency debt securities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 236 184
Unrealized Gains 2 3
Unrealized Losses 0 0
Estimated Fair Value 238 187
Current marketable securities | Mortgage and asset-backed debt securities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 171 188
Unrealized Gains 3 4
Unrealized Losses 0 (1)
Estimated Fair Value 174 191
Current marketable securities | Corporate debt securities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 158 835
Unrealized Gains 5 4
Unrealized Losses 0 (2)
Estimated Fair Value 163 837
Current marketable securities | U.S. state and local municipal debt securities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 15 15
Unrealized Gains 0 0
Unrealized Losses 0 0
Estimated Fair Value 15 15
Current marketable securities | Other debt and equity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Cost 7 10
Unrealized Gains 0 1
Unrealized Losses 0 0
Estimated Fair Value $ 7 $ 11