Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	$ 474	$ 141
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet	95	142
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet	46	20
Fair value on a recurring basis \| Foreign currency forward/option contracts
Assets and Liabilities Measured on Recurring Basis
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet	82	125
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet	46	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	13	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	233	85
Fair value on a recurring basis \| Certificates of deposit/time deposits
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	47	10
Fair value on a recurring basis \| U.S. treasury securities
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	150
Fair value on a recurring basis \| U.S. municipal securities
Assets and Liabilities Measured on Recurring Basis
Available-for-sale marketable securities	37	46
Fair value on a recurring basis \| Investments
Assets and Liabilities Measured on Recurring Basis
Investments	5	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	150
Fair value on a recurring basis \| Level 1 \| Investments
Assets and Liabilities Measured on Recurring Basis
Investments	5	25
Fair value on a recurring basis \| Level 2 \| Foreign currency forward/option contracts
Assets and Liabilities Measured on Recurring Basis
Gross Amounts of Derivative Assets Presented in the Consolidated Balance Sheet	82	125
Gross Amounts of Derivative Liabilities Presented in the Consolidated Balance Sheet	46	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	13	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	233	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	47	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	$ 37	$ 46

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