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Commitments and Contingencies (Wildfire loss accrual) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | 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 | 1,265 | $ 1,297 |
Amounts paid |  |  | (3,392) |  |
Ending balance | 2,256 |  | 2,256 |  | $ 4,383
2017/2018 Wildfire/Mudslide Events | Other current liabilities |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 2,231 |  |
Ending balance | 84 |  | 84 |  | 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 |  |  | 2,308 |  |
Ending balance |  |  |  |  | 2,281
November 2018 - Woolsey Wildfires |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Litigation settlement |  |  |  |  | 2,212
November 2018 - Woolsey Wildfires | Other long-term liabilities |  |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 2,152 |  |
Ending balance | 2,172 |  | 2,172 |  | 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 | $ 136 |  | $ 136 |  | $ 129

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Definition Amount of cash outflow reducing loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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