Pension and Postretirement Benefit Plans - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2023 USD ($)
Qualified and Non-qualified Pension Benefits
Schedule Of Defined Contribution Plans Disclosures
Company contributions	$ 26
Postretirement Benefits
Schedule Of Defined Contribution Plans Disclosures
Company contributions	$ 1

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration