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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
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Mar. 31, 2020 | Sep. 30, 2020
Retirement Benefits [Abstract] |  |
Defined contribution plan, employer matching contribution, percent of match | 7.00% |
Reduction in accumulated postretirement benefit obligation related to plan amendment |  | $ 157
Adjustment in other comprehensive income related to plan amendment |  | 118
Deferred income taxes related to plan amendment |  | $ 39
Amortization period for reduction of future net periodic cost |  | 3 years 4 months 24 days
Actuarial loss related to plan amendment |  | $ 12

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- Definition Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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