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Benefit Plans - Cash flows narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Pension benefits |  |
Components of net periodic cost |  |
Defined benefit pension plans, estimated employer contributions in next fiscal year | $ 25,000,000 |
Employer contribution | 27,000,000 | $ 16,000,000
Postretirement benefits |  |
Components of net periodic cost |  |
Defined benefit pension plans, estimated employer contributions in next fiscal year | 0 |
Employer contribution | 24,000,000 | 22,000,000
Participant contributions | 15,000,000 | $ 13,000,000
Other Pension Plan |  |
Components of net periodic cost |  |
Defined benefit pension plans, estimated employer contributions in next fiscal year | $ 4,000,000 |

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