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Derivatives - Fair Value Hedge (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2021
Interest rate contracts
Derivatives
Derivative, notional amount		$ 800,000,000
Floating rate registered note due 2049
Derivatives
Principal amount		500,000,000
Floating rate registered note due 2050
Derivatives
Principal amount		300,000,000
Fixed rate registered note due 2049
Derivatives
Principal amount	$ 500,000,000	1,000,000,000.0
Fixed rate registered note due 2050
Derivatives
Principal amount	$ 350,000,000	$ 650,000,000

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- Definition

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

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- Definition

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