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Financial Instruments - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Aug. 20, 2018	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Total long-term debt	$ 7,750		$ 7,750		$ 6,500
Unamortized debt discount / debt issuance costs	(70)		(70)		(51)
Long-term debt, net of discount and issuance costs	7,194		7,194		5,947
Interest expense, net of capitalized interest	58	$ 55	111	$ 111
Capitalized interest	4	$ 3	8	$ 6
Current portion of long-term debt	500		500		500
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	14		14		(2)
Senior Notes
Debt Instrument [Line Items]
Total long-term debt						$ 1,500	$ 1,250	$ 1,250	$ 3,650
Senior Notes \| 3.450% 2015 senior notes due 2020
Debt Instrument [Line Items]
Total long-term debt	500		500		500
Senior Notes \| 2018 floating senior notes due 2021
Debt Instrument [Line Items]
Total long-term debt	300		300		300
Senior Notes \| 3.250% 2018 senior notes due 2021
Debt Instrument [Line Items]
Total long-term debt	$ 300		$ 300		300
Senior Notes \| 3.250% 2013 senior notes due 2023
Debt Instrument [Line Items]
Interest rate percentage	3.25%		3.25%
Total long-term debt	$ 1,350		$ 1,350		1,350
Senior Notes \| 4.500% 2015 senior notes due 2025
Debt Instrument [Line Items]
Total long-term debt	750		750		750
Senior Notes \| 3.000% 2017 senior notes due 2027
Debt Instrument [Line Items]
Total long-term debt	750		750		750
Senior Notes \| 3.900% 2018 senior notes due 2028
Debt Instrument [Line Items]
Total long-term debt	500		500		500
Senior Notes \| 4.700% 2013 senior notes due 2043
Debt Instrument [Line Items]
Total long-term debt	1,150		1,150		1,150
Senior Notes \| 3.950% 2017 senior notes due 2047
Debt Instrument [Line Items]
Total long-term debt	500		500		500
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Total long-term debt	400		400		400
Senior Notes \| Senior notes 2.000% due 2030
Debt Instrument [Line Items]
Total long-term debt	750		750		0
Senior Notes \| Senior Notes 3.000% due 2050
Debt Instrument [Line Items]
Total long-term debt	$ 500		$ 500		$ 0