Pension and Postretirement Benefit Plans - Narrative (Details) $ in Millions	6 Months Ended
Jun. 30, 2023 USD ($)
Qualified and Non-qualified Pension Benefits
Schedule Of Defined Contribution Plans Disclosures
Company contributions	$ 53
Postretirement Benefits
Schedule Of Defined Contribution Plans Disclosures
Company contributions	$ 4

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

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