Fair Value Measurements Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivatives	$ 98	$ 76
Derivatives	(50)	(69)
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	1,370	2,230
Commercial paper	225	149
Corporate notes	262	333
U.S. government agencies	1	114
Other equity investments	20	54
Derivatives	98	76
Assets, Fair Value Disclosure	1,976	2,956
Derivatives	(50)	(69)
Total liabilities	(50)	(69)
Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Money market funds	1,370	2,230
Other equity investments	20	54
Assets, Fair Value Disclosure	1,390	2,284
Fair Value, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Commercial paper	225	149
Corporate notes	262	333
U.S. government agencies	1	114
Derivatives	98	76
Assets, Fair Value Disclosure	586	672
Derivatives	(50)	(69)
Total liabilities	$ (50)	$ (69)