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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Amount, after accumulated amortization, of debt discount.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Financial Instruments - Senior Notes Offering and Other Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	May 12, 2020	Aug. 20, 2018	Sep. 12, 2017	Nov. 13, 2015	Jan. 28, 2013
Debt Instrument [Line Items]
Debt, principal amount	$ 7,250	$ 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 \| 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%