Fair Value Measurements - Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Foreign currency forward contracts
Derivatives:
Foreign currency forward contracts, assets	$ 3
Liabilities
Foreign currency forward contracts		$ 14
Recurring basis
Investments:
Total assets	1,335	493
Recurring basis \| Foreign currency forward contracts
Derivatives:
Foreign currency forward contracts, assets	3
Liabilities
Foreign currency forward contracts		14
Recurring basis \| Money market funds
Cash equivalents:
Cash equivalents	47	147
Recurring basis \| Mutual funds
Cash equivalents:
Cash equivalents	23
Recurring basis \| Term deposits
Cash equivalents:
Cash equivalents	153	49
Investments:
Investments	200	24
Recurring basis \| Equity investments
Investments:
Investments	909	123
Recurring basis \| U.S. treasury securities
Cash equivalents:
Cash equivalents		150
Recurring basis \| Level 1
Investments:
Total assets	164	420
Recurring basis \| Level 1 \| Foreign currency forward contracts
Derivatives:
Foreign currency forward contracts, assets	0
Liabilities
Foreign currency forward contracts		0
Recurring basis \| Level 1 \| Money market funds
Cash equivalents:
Cash equivalents	47	147
Recurring basis \| Level 1 \| Mutual funds
Cash equivalents:
Cash equivalents	23
Recurring basis \| Level 1 \| Term deposits
Cash equivalents:
Cash equivalents	0	0
Investments:
Investments	0	0
Recurring basis \| Level 1 \| Equity investments
Investments:
Investments	94	123
Recurring basis \| Level 1 \| U.S. treasury securities
Cash equivalents:
Cash equivalents		150
Recurring basis \| Level 2
Investments:
Total assets	356	73
Recurring basis \| Level 2 \| Foreign currency forward contracts
Derivatives:
Foreign currency forward contracts, assets	3
Liabilities
Foreign currency forward contracts		14
Recurring basis \| Level 2 \| Money market funds
Cash equivalents:
Cash equivalents	0	0
Recurring basis \| Level 2 \| Mutual funds
Cash equivalents:
Cash equivalents	0
Recurring basis \| Level 2 \| Term deposits
Cash equivalents:
Cash equivalents	153	49
Investments:
Investments	200	24
Recurring basis \| Level 2 \| Equity investments
Investments:
Investments	0	0
Recurring basis \| Level 2 \| U.S. treasury securities
Cash equivalents:
Cash equivalents		$ 0
Recurring basis \| Level 3
Investments:
Total assets	815
Recurring basis \| Level 3 \| Foreign currency forward contracts
Derivatives:
Foreign currency forward contracts, assets	0
Recurring basis \| Level 3 \| Money market funds
Cash equivalents:
Cash equivalents	0
Recurring basis \| Level 3 \| Mutual funds
Cash equivalents:
Cash equivalents	0
Recurring basis \| Level 3 \| Term deposits
Cash equivalents:
Cash equivalents	0
Investments:
Investments	0
Recurring basis \| Level 3 \| Equity investments
Investments:
Investments	$ 815

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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