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Financial Instruments (Schedule of Long-term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Aug. 20, 2018	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Total	$ 6,650	$ 7,250
Unamortized debt discount / debt issuance costs	(60)	(66)
Less current portion of long-term debt	0	600
Cumulative fair value adjustment for interest rate swap contracts	2	11
Long-term debt, net of discount and issuance costs	6,592	6,595
Senior Notes
Debt Instrument [Line Items]
Total			$ 1,500	$ 1,250	$ 1,250	$ 3,650
Senior Notes \| 3.450% 2015 senior notes due 2020
Debt Instrument [Line Items]
Debt, stated interest percentage rate					3.45%
Senior Notes \| 2018 floating rate (three-month USD LIBOR plus 0.44%) senior notes due 2021
Debt Instrument [Line Items]
Total	0	300
Senior Notes \| 3.250% 2018 senior notes due 2021
Debt Instrument [Line Items]
Debt, stated interest percentage rate					3.25%
Total	0	300
Senior Notes \| 3.250% 2013 senior notes due 2023
Debt Instrument [Line Items]
Debt, stated interest percentage rate			3.25%
Total	1,350	1,350
Senior Notes \| 4.500% 2015 senior notes due 2025
Debt Instrument [Line Items]
Debt, stated interest percentage rate					4.50%
Total	750	750
Senior Notes \| 3.000% 2017 senior notes due 2027
Debt Instrument [Line Items]
Debt, stated interest percentage rate				3.00%
Total	750	750
Senior Notes \| 3.900% 2018 senior notes due 2028
Debt Instrument [Line Items]
Debt, stated interest percentage rate			3.90%
Total	500	500
Senior Notes \| 4.700% 2013 senior notes due 2043
Debt Instrument [Line Items]
Debt, stated interest percentage rate						4.70%
Total	1,150	1,150
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Debt, stated interest percentage rate				3.95%
Total	500	500
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Debt, stated interest percentage rate			4.45%
Total	400	400
Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Fair value, debt instrument	$ 7,443	$ 7,835