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Pension and Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2021
Benefit Plan Information |  |  |  |  |
Defined benefit pension and postretirement plans adjustment | $ (121) | $ (47) | $ (240) | $ (155) |
Qualified and Non-qualified Pension Benefits | Funded |  |  |  |  |
Benefit Plan Information |  |  |  |  |
Company contributions year to date |  |  | 83 |  |
Postretirement Benefits | Funded |  |  |  |  |
Benefit Plan Information |  |  |  |  |
Company contributions year to date |  |  | 2 |  |
Total Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Benefit Plan Information |  |  |  |  |
Defined benefit pension and postretirement plans adjustment | $ (121) | $ (47) | $ (240) | $ (155) |
Forecast | Pension and Postretirement Benefit Plans | Funded | Maximum |  |  |  |  |
Benefit Plan Information |  |  |  |  |
Estimated pension and postretirement employer contributions in current fiscal year |  |  |  |  | $ 200

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