Fair Value Measurements (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset		$ 90	$ 55	$ 266
Derivative Liability		62	135	108
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value		65	226
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 | US Treasury Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Debt Securities, Available-for-sale	[1]	65	226
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets at Fair Value		139	98	276
Liabilities at Fair Value		62	135	108
Marketable Securities		49	43	10
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Asset	[2]	90	55	266
Derivative Liability	[2]	$ 62	$ 135	$ 108

[1] The company's investments in debt securities, which are available-for-sale, are included in "marketable securities" in the interim Condensed Consolidated Balance Sheets

[2] See Note 16 - Financial Instruments for the classification of derivatives in the interim Condensed Consolidated Balance Sheets.