Fair Value Measurements and Disclosures - Assets Measured on Recurring Basis or Disclosed at Fair Value (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value Measurement or Disclosure		$ 460	$ 529
Short-term investments, Fair Value Measurement or Disclosure		2,506	2,860
Total assets, Fair Value Measurement or Disclosure		3,157	3,601
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value Measurement or Disclosure			108
Short-term investments, Fair Value Measurement or Disclosure		30	79
Total assets, Fair Value Measurement or Disclosure		134	309
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value Measurement or Disclosure		460	421
Short-term investments, Fair Value Measurement or Disclosure		2,476	2,781
Total assets, Fair Value Measurement or Disclosure		3,023	3,292
Time Deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value Measurement or Disclosure		360	321
Short-term investments, Fair Value Measurement or Disclosure		1,464	1,726
Time Deposits [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value Measurement or Disclosure		360	321
Short-term investments, Fair Value Measurement or Disclosure		1,464	1,726
Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value Measurement or Disclosure			45
Money Market Funds [Member] | Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value Measurement or Disclosure			45
Fixed Income Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value Measurement or Disclosure	[1]	100	163
Short-term investments, Fair Value Measurement or Disclosure	[1]	870	1,055
Fixed Income Debt Securities [Member] | Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value Measurement or Disclosure	[1]		63
Fixed Income Debt Securities [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents, Fair Value Measurement or Disclosure	[1]	100	100
Short-term investments, Fair Value Measurement or Disclosure	[1]	870	1,055
Structured Deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments, Fair Value Measurement or Disclosure		142
Structured Deposits [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments, Fair Value Measurement or Disclosure		142
Investment in Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other assets, Fair Value Measurement or Disclosure		104	122
Investment in Equity Securities [Member] | Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other assets, Fair Value Measurement or Disclosure		104	122
Variable Return Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments, Fair Value Measurement or Disclosure		30	79
Variable Return Investments [Member] | Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Short-term investments, Fair Value Measurement or Disclosure		30	79
Long-term Time Deposits [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other assets, Fair Value Measurement or Disclosure		87	90
Long-term Time Deposits [Member] | Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other assets, Fair Value Measurement or Disclosure		$ 87	$ 90

[1] Classified as held-to-maturity investments and measured at amortized cost.