Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Financial Instruments - Senior Notes Offering and Other Long-Term Debt (Details) - USD ($) $ in Millions		9 Months Ended
	Aug. 20, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	May 12, 2020	Aug. 20, 2018	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Repayments of long-term debt		$ 600	$ 0
Debt, principal amount		6,650		$ 7,250
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]
Repayments of long-term debt	$ 300
Debt, principal amount		0		300
Senior Notes \| 3.250% 2018 senior notes due 2021
Debt Instrument [Line Items]
Repayments of long-term debt	$ 300
Debt, principal amount		$ 0		300
Interest rate percentage		3.25%
Senior Notes \| 2020 Senior Notes
Debt Instrument [Line Items]
Debt, principal amount					$ 1,250
Original issue discount					$ 10
Senior Notes \| 2.000% 2020 senior notes due 2030
Debt Instrument [Line Items]
Debt, principal amount		$ 750		750
Interest rate percentage		2.00%
Senior Notes \| 3.000% 2020 senior notes due 2050
Debt Instrument [Line Items]
Debt, principal amount		$ 500		$ 500
Interest rate percentage		3.00%
Senior Notes \| Senior Notes 3.450% Due 2020
Debt Instrument [Line Items]
Debt, principal amount		$ 500
Interest rate percentage		3.45%