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Commitments and Contingencies (Schedule of Estimated Losses) (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2020 USD ($)
Loss Contingencies [Line Items] |
Balance at December 31, 2019 | $ 4,568
Balance at June 30, 2020 | 4,561
2017/2018 Wildfire/Mudslide Event |
Loss Contingencies [Line Items] |
Balance at December 31, 2019 | 4,541
Accrued losses | 0
Payments | (13)
Balance at June 30, 2020 | $ 4,528

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