Commitments and Contingencies - PAC - Contingency Accrual (Details) - 2020 Wildfires - PAC - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Loss Contingency Accrual [Roll Forward]
Beginning balance	$ 424	$ 252
Accrued losses	400	0
Ending balance	$ 824	$ 252

Amount of loss contingency liability.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14615-108349

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant