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Retirement Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Estimated net actuarial loss for the defined benefit pension plan | $ 12 |
Estimated amortization of prior service credit and transition asset to be reclassified from AOCI | 1 |
Actual return | 52 | $ (2)
Estimated future employer contributions in next fiscal year | 24 |
(Level 3) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual return | $ 24 |

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