Derivatives - Fair Value Hedge (Details) - USD ($)	9 Months Ended
Sep. 30, 2023	Dec. 31, 2022
Derivatives
Hedged Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt
Fair value hedges
Derivatives
Carrying Value of the Hedged Liabilities	$ 886,000,000	$ 903,000,000
Fair value hedges \| Long-term debt
Derivatives
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Value of the Hedged Liabilities	(117,000,000)	$ (98,000,000)
Fixed rate 30-year debenture due 2028 \| Fair value hedges
Derivatives
Principal amount	$ 220,000,000
Fixed rate 30-year debenture due 2028 \| Fair value hedges \| Interest rate contracts
Derivatives
Term of debt instrument (in years)	30 years

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

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- Definition

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.

+ References

No definition available.

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- Definition

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.

+ References

No definition available.

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- Definition

Amount of liability hedged in fair value hedging relationship.

+ References

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- Definition

Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk.

+ References

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- Definition

Indicates line item in statement of financial position that includes hedged liability.

+ References

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