Face (par) amount of debt instrument at time of issuance.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Nominal or face amount used to calculate payment on derivative.

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Long-Term Debt and Short-Term Borrowings - Long-Term Debt Issuances and Fixed-to-Floating Interest Rate Swaps (Details) - USD ($)	1 Months Ended
	Mar. 31, 2020	Dec. 31, 2022	Sep. 30, 2021
Floating rate registered note due 2049
Debt instrument [Line Items]
Principal amount			$ 500,000,000
Floating rate registered note due 2050 \| London Interbank Offered Rate (LIBOR)
Debt instrument [Line Items]
Principal amount			300,000,000
Fixed rate registered note due 2049
Debt instrument [Line Items]
Principal amount		$ 500,000,000	1,000,000,000
Effective interest rate (as a percent)		3.37%
Fixed rate registered note due 2050
Debt instrument [Line Items]
Principal amount	$ 650,000,000	$ 350,000,000	650,000,000
Term of debt instrument (in years)	30 years
Effective interest rate (as a percent)	3.70%	3.72%
Aggregate Fixed Rate Registered Notes
Debt instrument [Line Items]
Principal amount	$ 1,750,000,000
Fixed rate registered note due 2025
Debt instrument [Line Items]
Principal amount	$ 500,000,000	$ 750,000,000
Term of debt instrument (in years)	5 years
Effective interest rate (as a percent)	2.65%	2.12%
Fixed rate registered note due 2030
Debt instrument [Line Items]
Principal amount	$ 600,000,000	$ 600,000,000
Term of debt instrument (in years)	10 years
Effective interest rate (as a percent)	3.05%	3.09%
Interest rate contracts
Debt instrument [Line Items]
Derivative, notional amount			$ 800,000,000