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Retirement Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Estimated net actuarial loss for the defined benefit pension plan | $ 7 |
Estimated amortization of prior service credit and transition asset to be reclassified from AOCI | 1 |
Actual return | (2) | $ 21
Estimated future employer contributions in next fiscal year | 25 |
Other | (Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual return | $ 7 |

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