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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% |
Accrued pension and postretirement benefits |  | $ (157)
Other comprehensive income |  | 118
Deferred income taxes |  | $ 39
Future remaining service period of eligible active employees (in years) |  | 3 years 4 months 24 days
Actuarial loss |  | $ 12

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