Fair Value Measurements Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, Assets	$ 2	$ 14
Derivatives, Liabilities	(301)	(118)
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	8,877	2,562
Commercial Paper, at Carrying Value	93	108
Available for sale debt instruments	321	242
Available for Sale Securities, Government Agencies		55
Investments, Fair Value Disclosure	40	33
Derivatives, Assets	2	14
Total assets	9,333	3,014
Derivatives, Liabilities	(301)	(118)
Total liabilities	(301)	(118)
Fair Value, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	8,877	2,562
Available for Sale Securities, Government Agencies		55
Investments, Fair Value Disclosure	40	33
Total assets	8,917	2,650
Fair Value, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Commercial Paper, at Carrying Value	93	108
Available for sale debt instruments	321	242
Derivatives, Assets	2	14
Total assets	416	364
Derivatives, Liabilities	(301)	(118)
Total liabilities	$ (301)	$ (118)