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Financial Instruments (Interest Rate Risk) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Aug. 20, 2018	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Less current portion of long-term debt	$ 0	$ 600
Debt, principal amount	6,650	7,250
Senior Notes
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt, principal amount			$ 1,500	$ 1,250	$ 1,250	$ 3,650
Senior Notes \| 4.500% 2015 senior notes due 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt, stated interest percentage rate					4.50%
Debt, principal amount	750	750
Senior Notes \| Senior Notes 2.000% Due 2030
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt, principal amount	750	750
Senior Notes \| Senior Notes 3.000% Due 2050
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt, principal amount	500	500
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	$ 550	$ 550