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- Amortized Cost and Estimated Fair Value of Marketable Securities by Contractual Maturity (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cost |  |
Marketable Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis | $ 27 |
Due after one year through three years | 323 |
Due after three years through five years | 10 |
Marketable Securities, Debt Maturities, After Five Years, Amortized Cost Basis | 36 |
Marketable Securities, Debt Maturities, Amortized Cost, Total | 396 |
Equity securities | 2 |
Marketable Securities, Amortized Cost, Total | 398 | $ 497
Estimated Fair Value |  |
Due in one year or less | 27 |
Due after one year through three years | 327 |
Due after three years through five years | 10 |
Due after five years | 40 |
Marketable Securities, Debt Maturities, Fair Value, Total | 404 |
Equity securities | 2 |
Marketable securities | 406 | 503
Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 429 | 525
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 207 | 214
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 222 | 310
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 1
Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 406 | 503
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 184 | 193
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 222 | 310
Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Other Long-term Investments | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 23 | 22
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 23 | 21
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Other Long-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 1
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 184 | 193
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 184 | 193
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
U.S. government and agency debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 31 | 47
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 31 | 47
Mortgage and asset-backed debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 178 | 245
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 178 | 245
Corporate debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Equity securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 2 | 2
Equity securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Equity securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 2 | 2
Equity securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 11 | 16
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 0 | 0
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | 11 | 16
Non-U.S. government debt securities | Marketable securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Value |  |
Investments, Fair Value Disclosure | $ 0 | $ 0

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