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Pension and Other Postretirement Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |  |  |
Company match percentage |  |  | 7.00% |  |
Contributions |  |  | $ 83 | $ 84 | $ 81
Adjustment to OCI |  | $ 118 |  |  |
Deferred taxes |  | $ 39 |  |  |
Amortization period |  | 3 years 4 months 24 days |  |  |
Actuarial loss |  | $ 12 |  |  |
Common Stock |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |  |  |
Contributions | $ 48 |  |  |  |
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |  |  |
Decrease in postretirement obligations |  | $ 156 |  | 15 |
Transfer of liabilities |  |  | 0 | 0 |
Employer contribution |  |  | 24 | 28 |
Postretirement benefit expense |  |  | $ 19 | (7) | (22)
United States Pension Benefits | Postretirement Health Coverage |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |  |  |
Service requirement |  |  | 10 years |  |
Plan, age requirement |  |  | 55 years |  |
United States Pension Benefits | Pension Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |  |  |
Decrease in postretirement obligations |  |  | $ 0 | 0 |
Transfer of liabilities |  |  | 0 | 0 |
Employer contribution |  |  | 5 | 37 |
Postretirement benefit expense |  |  | $ (33) | $ (2) | $ 0
United States Pension Benefits | Pension Benefits | Equity Securities |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |  |  |
Target plan asset allocations | 20.00% |  | 20.00% |  |
United States Pension Benefits | Pension Benefits | Fixed Income Funds |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items] |  |  |  |  |
Target plan asset allocations | 80.00% |  | 80.00% |  |

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