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Compensation and Benefit Plans (Other Postretirement Plan Assets - Fair Value Levels) (Details) - Postretirement Benefits Other Than Pensions - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 2,484 $ 2,155  
Fair value NAV 720 584  
Receivables and payables, net (19) (22)  
Net plan assets available for benefits 2,465 2,133 $ 2,330
Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 696 591  
Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,068 980  
U.S. government and agency securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 449 371  
Fair value NAV 0 0  
U.S. government and agency securities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 386 322  
U.S. government and agency securities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 63 49  
Corporate stocks      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 244 204  
Fair value NAV $ 0 $ 0  
Corporate stocks | Russell Indexes      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Performance percentage benchmark, percentage 68.00% 67.00%  
Corporate stocks | MSCI All Country World Index      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Performance percentage benchmark, percentage 32.00% 33.00%  
Corporate stocks | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 242 $ 204  
Corporate stocks | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 2 0  
Corporate notes and bonds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 885 832  
Fair value NAV 0 0  
Corporate notes and bonds | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Corporate notes and bonds | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 885 832  
Common/collective funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 652 495  
Fair value NAV $ 652 $ 495  
Common/collective funds | MSCI-EAFE      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations, percentage 74.00% 74.00%  
Common/collective funds | Non-index U.S. equity fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations, percentage 19.00% 19.00%  
Common/collective funds | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 0 $ 0  
Common/collective funds | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Partnerships      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 68 89  
Fair value NAV $ 68 $ 89  
Partnerships | Private equity and venture capital funds including branded consumer products, clean and information technology and healthcare      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations, percentage 55.00% 48.00%  
Partnerships | Broad range of financial assets in all global markets      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations, percentage 15.00% 34.00%  
Partnerships | Asset backed securities including distressed mortgages      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations, percentage 28.00% 17.00%  
Partnerships | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 0 $ 0  
Partnerships | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Registered investment companies      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 66 38  
Fair value NAV 0 0  
Registered investment companies | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 66 38  
Registered investment companies | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Interest bearing cash      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 17 22  
Fair value NAV 0 0  
Interest bearing cash | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 22  
Interest bearing cash | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 17 0  
Other      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 103 104  
Fair value NAV 0 0  
Other | Municipal securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 66 58  
Other | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 2 5  
Other | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 101 99  
Collateralized mortgage obligations and other asset backed securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Receivables and payables, net 49 59  
SCE      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net plan assets available for benefits $ 2,464 $ 2,133 $ 2,330