Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Financial Instruments - Senior Notes Offering and Other Long-Term Debt (Details) - USD ($)	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]
Commercial Paper	$ 1,500,000		$ 1,500,000		$ 0
Debt, principal amount	7,750,000,000		7,750,000,000		6,500,000,000
Current portion of long-term debt	500,000,000		500,000,000		500,000,000
Capitalized interest	4,000,000	$ 3,000,000	8,000,000	$ 6,000,000
Senior Notes
Debt Instrument [Line Items]
Debt, principal amount						$ 1,500,000,000	$ 1,250,000,000	$ 1,250,000,000	$ 3,650,000,000
Debt, unamortized discount						$ 4,000,000	$ 7,000,000	$ 2,000,000	$ 10,000,000
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	300,000,000		300,000,000		300,000,000
Senior Notes \| 3.250% 2018 senior notes due 2021
Debt Instrument [Line Items]
Debt, principal amount	300,000,000		300,000,000		300,000,000
Senior Notes \| 3.000% 2017 senior notes due 2027
Debt Instrument [Line Items]
Debt, principal amount	750,000,000		750,000,000		750,000,000
Senior Notes \| 3.900% 2018 senior notes due 2028
Debt Instrument [Line Items]
Debt, principal amount	500,000,000		500,000,000		500,000,000
Senior Notes \| 3.950% 2017 senior notes due 2047
Debt Instrument [Line Items]
Debt, principal amount	500,000,000		500,000,000		500,000,000
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Debt, principal amount	$ 400,000,000		$ 400,000,000		$ 400,000,000
Senior Notes \| Senior notes due 2018
Debt Instrument [Line Items]
Interest rate percentage	3.90%		3.90%