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Valuation of Debt and Equity Investments and Certain Liabilities - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Disclosures [Abstract] |  |  |
Credit losses related to available-for-sale investments | $ 0 | $ 0 | $ 0
Proceeds from sales, redemptions and maturities of short-term available-for-sale securities | 2,309,000,000 | 6,708,000,000 | 4,095,000,000
Net gains (losses) from equity method investments | 32,000,000 | 5,000,000 | 4,000,000
Realized gains from sale of equity method investments | 29,000,000 | 11,000,000 | $ 6,000,000
Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total assets fair value | 0 | 0 |
Total liabilities fair value | 0 | 0 |
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total assets fair value | 5,213,000,000 | 4,229,000,000 |
Total liabilities fair value | $ 298,000,000 | $ 246,000,000 |

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