Fair Value Measurements Fair Value Measurement Recurring Basis (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Derivative Asset, Foreign Currency		$ 55	$ 25
Derivative Liability, Foreign Currency		135	43
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Marketable securities		43	5
Total assets at fair value		98	30
Total Liabilities at fair value		135	43
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Derivative Asset, Foreign Currency	[1]	55	25
Derivative Liability, Foreign Currency	[1]	135	$ 43
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Total assets at fair value		226
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Derivative Asset, U.S Treasuries	[2]	$ 226

[1] See Note 22 - Financial Instruments, to the Consolidated Financial Statements, for the classification of derivatives in the Consolidated Balance Sheets.

[2] The company's investments in debt securities, which are primarily available-for-sale, are included in "marketable securities" in the Consolidated Balance sheets.