Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	$ 434	$ 141
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet	44	142
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet	106	20
Fair value on a recurring basis \| Foreign currency exchange contracts
Assets and Liabilities Measured on Recurring Basis
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet	37	125
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet	106	20
Fair value on a recurring basis \| Interest rate contracts
Assets and Liabilities Measured on Recurring Basis
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet	7	17
Fair value on a recurring basis \| Corporate debt securities
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	7
Fair value on a recurring basis \| Commercial paper
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	237	85
Fair value on a recurring basis \| Certificates of deposit/time deposits
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	31	10
Fair value on a recurring basis \| U.S. treasury securities
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	125
Fair value on a recurring basis \| U.S. municipal securities
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	34	46
Fair value on a recurring basis \| Investments
Assets and Liabilities Measured on Recurring Basis
Investments		25
Fair value on a recurring basis \| Level 1 \| U.S. treasury securities
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	125
Fair value on a recurring basis \| Level 1 \| Investments
Assets and Liabilities Measured on Recurring Basis
Investments		25
Fair value on a recurring basis \| Level 2 \| Foreign currency exchange contracts
Assets and Liabilities Measured on Recurring Basis
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet	37	125
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet	106	20
Fair value on a recurring basis \| Level 2 \| Interest rate contracts
Assets and Liabilities Measured on Recurring Basis
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet	7	17
Fair value on a recurring basis \| Level 2 \| Corporate debt securities
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	7
Fair value on a recurring basis \| Level 2 \| Commercial paper
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	237	85
Fair value on a recurring basis \| Level 2 \| Certificates of deposit/time deposits
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	31	10
Fair value on a recurring basis \| Level 3 \| U.S. municipal securities
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	$ 34	$ 46

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