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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 |
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 |
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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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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