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Investments and Fair Value Measurement - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) boardSeat | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Marketable Securities [Line Items] |  |  |  |  |  |
Proceeds from sale of non-marketable equity securities |  |  |  | $ 500,000,000 | $ 0 |
Upward adjustments | $ 0 |  | $ 0 | 71,000,000 | $ 0 |
Allowance for credit loss | 0 |  |  | 0 |  | $ 0
Grab |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Included in other comprehensive income (loss) | 497,000,000 |  |  | 1,700,000,000 |  |
Aurora |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Unrealized gain on investments | 102,000,000 |  |  | $ 573,000,000 |  |
Number of investee board seats held | boardSeat |  |  |  | 1 |  |
Didi |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Proceeds from sale of non-marketable equity securities |  | $ 500,000,000 |  |  |  |
Upward adjustments |  | $ 71,000,000 |  |  |  |
Unrealized gain on investments | (3,200,000,000) |  |  | $ (1,700,000,000) |  |
Zomato |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Unrealized gain on investments | 994,000,000 |  |  | 994,000,000 |  |
Equity securities | $ 1,100,000,000 |  |  | $ 1,100,000,000 |  |
Common Stock Equivalent | Aurora | Relative weighting |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Measurement input | 0.50 |  |  | 0.50 |  |
Option Pricing Model | Aurora |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Time to liquidity (in years) |  |  |  | 4 years 3 months |  |
Option Pricing Model | Aurora | Volatility |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Measurement input | 0.66 |  |  | 0.66 |  |
Option Pricing Model | Aurora | Relative weighting |  |  |  |  |  |
Marketable Securities [Line Items] |  |  |  |  |  |
Measurement input | 0.50 |  |  | 0.50 |  |

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