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Commitments and Contingencies (Wildfire loss accrual) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
2017/2018 Wildfire/Mudslide Events |  |
Loss Contingency Accrual [Roll Forward] |  |
Beginning balance | $ 4,383 |
Increase in accrued estimated losses to reflect best estimate | 1,265 | $ 1,297
Amounts paid | (3,914) |
Ending balance | 1,734 | 4,383
2017/2018 Wildfire/Mudslide Events | Other Current Liabilities |  |
Loss Contingency Accrual [Roll Forward] |  |
Beginning balance | 2,231 |
Ending balance | 131 | 2,231
2017/2018 Wildfire/Mudslide Events | Other long-term liabilities |  |
Loss Contingency Accrual [Roll Forward] |  |
Beginning balance | 2,281 |
Fixed payments to be made under settlement agreements | 1,733 |
Ending balance |  | 2,281
November 2018 Wildfires |  |
Loss Contingency Accrual [Roll Forward] |  |
Litigation settlement |  | 2,212
November 2018 Wildfires | Other long-term liabilities |  |
Loss Contingency Accrual [Roll Forward] |  |
Beginning balance | 2,152 |
Ending balance | 1,603 | 2,152
Other Wildfire Related Claims |  |
Loss Contingency Accrual [Roll Forward] |  |
Litigation settlement |  | 19
Other Wildfire Related Claims | Other long-term liabilities |  |
Loss Contingency Accrual [Roll Forward] |  |
Beginning balance | 129 |
Ending balance | $ 130 | $ 129

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