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Financial Instruments (Senior Notes and Other Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Aug. 20, 2018	Oct. 31, 2017	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Debt, principal amount	$ 6,500	$ 6,500
Current portion of long term debt	500	0
Senior Notes
Debt Instrument [Line Items]
Debt, principal amount			$ 1,500		$ 1,250	$ 1,250	$ 3,650
Debt, unamortized discount			$ 4		$ 7	$ 2	$ 10
Debt, purchase price percent due to downgrade of investment grade							101.00%
Senior Notes \| 2018 floating rate (three-month USD LIBOR plus 0.44%) senior notes due 2021
Debt Instrument [Line Items]
Debt, principal amount	300	300
Senior Notes \| 3.250% 2018 senior notes due 2021
Debt Instrument [Line Items]
Debt, principal amount	300	300
Debt, stated interest percentage rate			3.25%			3.25%
Senior Notes \| 3.900% 2018 senior notes due 2028
Debt Instrument [Line Items]
Debt, principal amount	500	500
Debt, stated interest percentage rate			3.90%
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Debt, principal amount	400	400
Debt, stated interest percentage rate			4.45%
Senior Notes \| 3.000% 2017 senior notes due 2027
Debt Instrument [Line Items]
Debt, principal amount	750	750
Debt, stated interest percentage rate					3.00%
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Debt, principal amount	$ 500	$ 500
Debt, stated interest percentage rate					3.95%
Senior Notes \| 1.875% 2013 senior notes due 2018
Debt Instrument [Line Items]
Current portion of long term debt				$ 750
Make whole premium and accrued interest				$ 4