Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Millions |
Jun. 30, 2019 |
Dec. 31, 2018 |
---|---|---|
Cost | ||
Due in one year or less | $ 147 | |
Due after one year through three years | 472 | |
Due after three years through five years | 21 | |
Due after five years | 77 | |
Marketable Securities, Debt Maturities, Amortized Cost, Total | 717 | |
Equity securities | 2 | |
Total Amortized Cost | 719 | $ 813 |
Estimated Fair Value | ||
Due in one year or less | 147 | |
Due after one year through three years | 474 | |
Due after three years through five years | 22 | |
Due after five years | 80 | |
Marketable Securities, Debt Maturities, Fair Value, Total | 723 | |
Equity securities | 2 | |
Total Estimated Fair Value | $ 725 | $ 810 |
X | ||||||||||
- Definition Marketable Securities, Fair Value [Abstract] No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Amortized Cost [Abstract] No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Amortized Cost Basis No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Debt Maturities, After Five Years, Amortized Cost Basis No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Debt Maturities, After Five Years, Fair Value No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Debt Maturities, After One Through Three Years, Amortized Cost Basis No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Debt Maturities, After One Through Three Years, Fair Value No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Debt Maturities, After Three Through Five Years, Amortized Cost Basis No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Debt Maturities, After Three Through Five Years, Fair Value No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Debt Maturities, Amortized Cost Basis No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Debt Maturities, Fair Value No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Debt Maturities, Next Twelve Months, Fair Value No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Equity Securities, Amortized Cost Basis No definition available.
|
X | ||||||||||
- Definition Marketable Securities, Equity Securities, Fair Value No definition available.
|
X | ||||||||||
- Definition Amount of investment in marketable security, classified as current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|