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Contractual interest rate for funds borrowed, under the debt agreement.

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Financial Instruments (Senior Notes and Other Long-Term Debt) (Details) - USD ($)	Oct. 13, 2020	Dec. 31, 2020	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		$ 7,250,000,000		$ 6,500,000,000
Current portion of long term debt		600,000,000		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 rate (three-month USD LIBOR plus 0.44%) 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
Debt, stated interest percentage rate							3.25%
Senior Notes \| 3.900% 2018 senior notes due 2028
Debt Instrument [Line Items]
Debt, principal amount		500,000,000		500,000,000
Debt, stated interest percentage rate					3.90%
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Debt, principal amount		400,000,000		400,000,000
Debt, stated interest percentage rate					4.45%
Senior Notes \| 3.000% 2017 senior notes due 2027
Debt Instrument [Line Items]
Debt, principal amount		750,000,000		750,000,000
Debt, stated interest percentage rate						3.00%
Senior Notes \| 4.450% 2018 senior notes due 2048
Debt Instrument [Line Items]
Debt, principal amount		500,000,000		500,000,000
Debt, stated interest percentage rate						3.95%
Senior Notes \| Senior Notes 2.000% Due 2030
Debt Instrument [Line Items]
Debt, principal amount		750,000,000		0
Senior Notes \| Senior Notes 3.000% Due 2050
Debt Instrument [Line Items]
Debt, principal amount		500,000,000		0
Senior Notes \| 2020 Senior Notes
Debt Instrument [Line Items]
Debt, principal amount			$ 1,250,000,000
Debt, unamortized discount			$ 10,000,000
Senior Notes \| 3.450% 2015 senior notes due 2020
Debt Instrument [Line Items]
Debt, principal amount		$ 0		$ 500,000,000
Debt, stated interest percentage rate							3.45%
Repayment of senior debt	$ 500,000,000