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Benefit Plans - Cash flows narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Pension benefits |  |
Components of net periodic cost |  |
Defined benefit pension plans, estimated employer contributions in next fiscal year | $ 26,000,000 |
Employer contribution | 16,000,000 | $ 131,000,000
Postretirement benefits |  |
Components of net periodic cost |  |
Defined benefit pension plans, estimated employer contributions in next fiscal year | 0 |
Employer contribution | 22,000,000 | 23,000,000
Participant contributions | $ 13,000,000 | $ 12,000,000

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