Compensation and Benefit Plans - Narrative (Details) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension and Other Postretirement Benefits
Health reimbursement monthly contribution	$ 200
Permissible range of asset class weights (percent)	5.00%
Assumed average equity risk premium (percent)	4.00%
Forecasted return on private equity and opportunistic investments (percent)	3.00%
Performance incentive plan award (in shares)	71
Share-based compensation available for grant (in shares)	13
Employee Stock Option
Pension and Other Postretirement Benefits
Expiration period	10 years
Volatility period	56 months	58 months	60 months
Employee Stock Option | Minimum
Pension and Other Postretirement Benefits
Vesting period	3 years
Employee Stock Option | Maximum
Pension and Other Postretirement Benefits
Vesting period	4 years
Pension Plan
Pension and Other Postretirement Benefits
Expected contributions	$ 44,000,000
Gain (loss) from change in discount rate	$ 159,000,000	$ (96,000,000)
Basis points in the discount rate	0.0052
Discount rate	5.56%	5.04%
Publicly traded equity investments located in the US (percent)	64.00%	62.00%
Pension Plan | Defined Benefit Plan, Equity Securities, US
Pension and Other Postretirement Benefits
Target plan asset allocations (percent)	17.30%
Pension Plan | Defined Benefit Plan, Equity Securities, Non-US
Pension and Other Postretirement Benefits
Target plan asset allocations (percent)	9.70%
Pension Plan | Fixed Income
Pension and Other Postretirement Benefits
Target plan asset allocations (percent)	55.00%
Pension Plan | Opportunistic Alternative Investments
Pension and Other Postretirement Benefits
Target plan asset allocations (percent)	18.00%
Pension Plan | SCE
Pension and Other Postretirement Benefits
Expected contributions		$ 15,000,000
Gain (loss) from change in discount rate	$ 146,000,000	$ (92,000,000)
Basis points in the discount rate	(0.0032)
Discount rate	5.56%	5.04%	5.36%
Other Postretirement Benefits Plan
Pension and Other Postretirement Benefits
Expected contributions	$ 0
Gain (loss) from change in discount rate	$ 41,000,000	$ 553,000,000
Discount rate	5.60%	5.06%
Eligibility age	55 years
Service period for eligibility (at least) (years)	10 years
Publicly traded equity investments located in the US (percent)	78.00%	78.00%
Other Postretirement Benefits Plan | Fixed Income
Pension and Other Postretirement Benefits
Target plan asset allocations (percent)	65.00%
Other Postretirement Benefits Plan | Opportunistic Alternative Investments
Pension and Other Postretirement Benefits
Target plan asset allocations (percent)	6.00%
Other Postretirement Benefits Plan | Global Equities
Pension and Other Postretirement Benefits
Target plan asset allocations (percent)	29.00%
Other Postretirement Benefits Plan | SCE
Pension and Other Postretirement Benefits
Gain (loss) from change in discount rate		$ 550,000,000
Discount rate	5.60%	5.06%
Other Pension, Postretirement and Supplemental Plans | Defined Benefit Plan, Equity Securities, Non-US
Pension and Other Postretirement Benefits
Target plan asset allocations (percent)	95.00%
Other Pension, Postretirement and Supplemental Plans | Global Equities
Pension and Other Postretirement Benefits
Target plan asset allocations (percent)	5.00%