Compensation and Benefit Plans (Pension Assets Fair Value) (Details) - Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 4,323	$ 4,194
Receivables and payables, net	(27)	(23)
Net plan assets available for benefits	$ 4,296	$ 4,171	$ 3,755
Publicly traded equity investments located in the US (percent)	62.00%	59.00%
Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 748	$ 797
Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	1,782	1,651
NAV
Pension and Other Postretirement Benefits
Fair value of plan assets	1,793	1,746
U.S. government and agency securities
Pension and Other Postretirement Benefits
Fair value of plan assets	1,135	1,157
U.S. government and agency securities | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	217	151
U.S. government and agency securities | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	918	1,006
U.S. government and agency securities | NAV
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Corporate stocks
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 470	$ 575
Corporate stocks | Russell Indexes
Pension and Other Postretirement Benefits
Performance percentage benchmark, percentage	44.00%	40.00%
Corporate stocks | MSCI
Pension and Other Postretirement Benefits
Performance percentage benchmark, percentage	56.00%	60.00%
Corporate stocks | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 466	$ 570
Corporate stocks | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	4	5
Corporate stocks | NAV
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Corporate bonds
Pension and Other Postretirement Benefits
Fair value of plan assets	815	601
Corporate bonds | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Corporate bonds | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	815	601
Corporate bonds | NAV
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Collateralized mortgage obligations and other asset backed securities
Pension and Other Postretirement Benefits
Fair value of plan assets	61	54
Common/collective funds
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 964	$ 1,017
Common/collective funds | Standard and Poor's 500
Pension and Other Postretirement Benefits
Performance percentage benchmark, percentage	41.00%	37.00%
Common/collective funds | Russell 1000 Index
Pension and Other Postretirement Benefits
Performance percentage benchmark, percentage	10.00%	13.00%
Common/collective funds | MSCI all country world index exUS
Pension and Other Postretirement Benefits
Performance percentage benchmark, percentage	38.00%	40.00%
Common/collective funds | Non-index U.S. equity fund
Pension and Other Postretirement Benefits
Performance percentage benchmark, percentage	9.00%	8.00%
Common/collective funds | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 0
Common/collective funds | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Common/collective funds | NAV
Pension and Other Postretirement Benefits
Fair value of plan assets	964	$ 1,017
Partnerships/joint ventures
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 688	569
Actual plan asset allocations, percentage	17.00%
Partnerships/joint ventures | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 0
Partnerships/joint ventures | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Partnerships/joint ventures | NAV
Pension and Other Postretirement Benefits
Fair value of plan assets	688	569
Other investment entities
Pension and Other Postretirement Benefits
Fair value of plan assets	110	137
Other investment entities | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Other investment entities | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Other investment entities | NAV
Pension and Other Postretirement Benefits
Fair value of plan assets	110	137
Registered investment companies
Pension and Other Postretirement Benefits
Fair value of plan assets	88	92
Registered investment companies | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	57	69
Registered investment companies | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Registered investment companies | NAV
Pension and Other Postretirement Benefits
Fair value of plan assets	31	23
Interest-bearing cash
Pension and Other Postretirement Benefits
Fair value of plan assets	8	7
Interest-bearing cash | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	8	7
Interest-bearing cash | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Interest-bearing cash | NAV
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Other investments
Pension and Other Postretirement Benefits
Fair value of plan assets	45	39
Other investments | Level 1
Pension and Other Postretirement Benefits
Fair value of plan assets	0
Other investments | Level 2
Pension and Other Postretirement Benefits
Fair value of plan assets	45	$ 39
Other investments | NAV
Pension and Other Postretirement Benefits
Fair value of plan assets	$ 0
Private equity and venture capital funds including branded consumer products, clean and information technology and healthcare
Pension and Other Postretirement Benefits
Actual plan asset allocations, percentage	62.00%	49.00%
Asset backed securities including distressed mortgages
Pension and Other Postretirement Benefits
Actual plan asset allocations, percentage		23.00%
Publicly traded fixed income securities
Pension and Other Postretirement Benefits
Actual plan asset allocations, percentage	15.00%	19.00%
Broad range of financial assets in all global markets
Pension and Other Postretirement Benefits
Actual plan asset allocations, percentage	3.00%	4.00%
Emerging market equity securities
Pension and Other Postretirement Benefits
Actual plan asset allocations, percentage	71.00%	77.00%
Equity Funds | MSCI World Total Return Index
Pension and Other Postretirement Benefits
Performance percentage benchmark, percentage	63.00%	73.00%
Fixed Income Funds
Pension and Other Postretirement Benefits
Actual plan asset allocations, percentage	35.00%	25.00%
SCE
Pension and Other Postretirement Benefits
Net plan assets available for benefits	$ 4,061	$ 3,940	$ 3,541