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 ($)	Mar. 31, 2020	Dec. 31, 2019	Aug. 20, 2018	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Commercial Paper	$ 0	$ 0
Debt, principal amount	6,500,000,000	6,500,000,000
Long-term debt current portion	500,000,000	500,000,000
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
Senior Notes \| 3.250% 2018 senior notes due 2021
Debt Instrument [Line Items]
Debt, principal amount	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
Senior Notes \| 3.900% 2018 senior notes due 2028
Debt Instrument [Line Items]
Debt, principal amount	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
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Debt, principal amount	$ 400,000,000	$ 400,000,000