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Financial Instruments - Senior Notes Offering and Other Long-Term Debt (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	May 12, 2020	Dec. 31, 2019	Aug. 20, 2018	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Debt, principal amount	$ 7,750		$ 7,750			$ 6,500
Current portion of long-term debt	1,100		1,100			500
Capitalized interest	4	$ 3	12	$ 9
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 senior notes due 2021
Debt Instrument [Line Items]
Debt, principal amount	300		300			300
Senior Notes \| 3.250% 2018 senior notes due 2021
Debt Instrument [Line Items]
Debt, principal amount	$ 300		$ 300			300
Interest rate percentage	3.25%		3.25%
Senior Notes \| 3.000% 2017 senior notes due 2027
Debt Instrument [Line Items]
Debt, principal amount	$ 750		$ 750			750
Interest rate percentage	3.00%		3.00%
Senior Notes \| 3.900% 2018 senior notes due 2028
Debt Instrument [Line Items]
Debt, principal amount	$ 500		$ 500			500
Interest rate percentage	3.90%		3.90%
Senior Notes \| 3.950% 2017 senior notes due 2047
Debt Instrument [Line Items]
Debt, principal amount	$ 500		$ 500			500
Interest rate percentage	3.95%		3.95%
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Debt, principal amount	$ 400		$ 400			400
Interest rate percentage	4.45%		4.45%
Senior Notes \| Senior notes due 2018
Debt Instrument [Line Items]
Interest rate percentage	3.90%		3.90%
Senior Notes \| 2020 Senior Notes
Debt Instrument [Line Items]
Debt, principal amount					$ 1,250
Original issue discount					$ 10
Senior Notes \| Senior Notes 3.000% due 2050
Debt Instrument [Line Items]
Debt, principal amount	$ 500		$ 500			0
Interest rate percentage	3.00%		3.00%
Senior Notes \| 3.450% 2015 senior notes due 2020
Debt Instrument [Line Items]
Debt, principal amount	$ 500		$ 500			500
Interest rate percentage	3.45%		3.45%
Senior Notes \| Senior notes 2.000% due 2030
Debt Instrument [Line Items]
Debt, principal amount	$ 750		$ 750			$ 0
Interest rate percentage	2.00%		2.00%