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Compensation and Benefit Plans (Pension Plan Assets - Fair Value Levels) (Details) - Pension Plans - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension and Other Postretirement Benefits      
Fair value of plan assets $ 3,393 $ 3,714  
Fair value NAV 1,098 1,363  
Receivables and payables, net (72) (98)  
Net plan assets available for benefits 3,321 3,616 $ 3,388
Level 1      
Pension and Other Postretirement Benefits      
Fair value of plan assets 697 1,051  
Level 2      
Pension and Other Postretirement Benefits      
Fair value of plan assets 1,598 1,300  
Level 3      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
U.S. government and agency securities      
Pension and Other Postretirement Benefits      
Fair value of plan assets 1,047 691  
Fair value NAV 0 0  
U.S. government and agency securities | Level 1      
Pension and Other Postretirement Benefits      
Fair value of plan assets 110 184  
U.S. government and agency securities | Level 2      
Pension and Other Postretirement Benefits      
Fair value of plan assets 937 507  
U.S. government and agency securities | Level 3      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Corporate stocks      
Pension and Other Postretirement Benefits      
Fair value of plan assets 479 729  
Fair value NAV $ 0 $ 0  
Corporate stocks | Russell Indexes      
Pension and Other Postretirement Benefits      
Performance percentage benchmark, percentage 43.00% 54.00%  
Corporate stocks | MSCI      
Pension and Other Postretirement Benefits      
Performance percentage benchmark, percentage 57.00% 46.00%  
Corporate stocks | Level 1      
Pension and Other Postretirement Benefits      
Fair value of plan assets $ 473 $ 718  
Corporate stocks | Level 2      
Pension and Other Postretirement Benefits      
Fair value of plan assets 6 11  
Corporate stocks | Level 3      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Corporate bonds      
Pension and Other Postretirement Benefits      
Fair value of plan assets 582 676  
Fair value NAV 0 0  
Corporate bonds | Level 1      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Corporate bonds | Level 2      
Pension and Other Postretirement Benefits      
Fair value of plan assets 582 676  
Corporate bonds | Level 3      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Common/collective funds      
Pension and Other Postretirement Benefits      
Fair value of plan assets 426 705  
Fair value NAV $ 426 $ 705  
Common/collective funds | Standard and Poor's 500      
Pension and Other Postretirement Benefits      
Performance percentage benchmark, percentage 43.00% 41.00%  
Common/collective funds | Russell 1000 index      
Pension and Other Postretirement Benefits      
Performance percentage benchmark, percentage 14.00% 15.00%  
Common/collective funds | MSCI All Country World Index exUS      
Pension and Other Postretirement Benefits      
Performance percentage benchmark, percentage 21.00% 15.00%  
Common/collective funds | Non-index U.S. equity fund      
Pension and Other Postretirement Benefits      
Performance percentage benchmark, percentage 15.00% 25.00%  
Common/collective funds | Level 1      
Pension and Other Postretirement Benefits      
Fair value of plan assets $ 0 $ 0  
Common/collective funds | Level 2      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Common/collective funds | Level 3      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Partnerships/joint ventures      
Pension and Other Postretirement Benefits      
Fair value of plan assets 434 396  
Fair value NAV $ 434 $ 396  
Partnerships/joint ventures | 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 50.00% 55.00%  
Partnerships/joint ventures | Broad range of financial assets in all global markets      
Pension and Other Postretirement Benefits      
Actual plan asset allocations, percentage 30.00% 20.00%  
Partnerships/joint ventures | Publicly traded fixed income securities      
Pension and Other Postretirement Benefits      
Actual plan asset allocations, percentage 16.00% 23.00%  
Partnerships/joint ventures | Level 1      
Pension and Other Postretirement Benefits      
Fair value of plan assets $ 0 $ 0  
Partnerships/joint ventures | Level 2      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Partnerships/joint ventures | Level 3      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Other investment entities      
Pension and Other Postretirement Benefits      
Fair value of plan assets 236 262  
Fair value NAV 236 262  
Other investment entities | Level 1      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Other investment entities | Level 2      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Other investment entities | Level 3      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Registered investment companies      
Pension and Other Postretirement Benefits      
Fair value of plan assets 114 140  
Fair value NAV 2 0  
Registered investment companies | Level 1      
Pension and Other Postretirement Benefits      
Fair value of plan assets 112 140  
Registered investment companies | Level 2      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Registered investment companies | Level 3      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Interest-bearing cash      
Pension and Other Postretirement Benefits      
Fair value of plan assets 2 9  
Fair value NAV 0 0  
Interest-bearing cash | Level 1      
Pension and Other Postretirement Benefits      
Fair value of plan assets 2 9  
Interest-bearing cash | Level 2      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Interest-bearing cash | Level 3      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Other      
Pension and Other Postretirement Benefits      
Fair value of plan assets 73 106  
Fair value NAV 0 0  
Other | Level 1      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Other | Level 2      
Pension and Other Postretirement Benefits      
Fair value of plan assets 73 106  
Other | Level 3      
Pension and Other Postretirement Benefits      
Fair value of plan assets 0 0  
Collateralized mortgage obligations and other asset backed securities      
Pension and Other Postretirement Benefits      
Fair value of plan assets 60 65  
SCE      
Pension and Other Postretirement Benefits      
Net plan assets available for benefits $ 3,124 $ 3,390 $ 3,172