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BENEFIT PLANS - Schedule of Assets by Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 3,759 $ 3,666 $ 4,118
Year End Allocation 100.00% 100.00%  
Pension Plans | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 405 $ 791  
Pension Plans | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1,841 1,789  
Pension Plans | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1,513 1,086  
Pension Plans | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 1,306 $ 1,266  
Year End Allocation 34.70% 34.50%  
Pension Plans | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 405 $ 793  
Pension Plans | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Equities | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 901 473  
Pension Plans | Domestic      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 109 $ 327  
Year End Allocation 2.90% 8.90%  
Pension Plans | Domestic | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 109 $ 327  
Pension Plans | Domestic | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Domestic | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Domestic | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 68 $ 290  
Year End Allocation 1.80% 7.90%  
Pension Plans | International | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 68 $ 290  
Pension Plans | International | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | International | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | International | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Common Collective Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 1,129 $ 649  
Year End Allocation 30.00% 17.70%  
Pension Plans | Common Collective Trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 228 $ 176  
Pension Plans | Common Collective Trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Common Collective Trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Common Collective Trusts | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 901 473  
Pension Plans | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 1,823 $ 1,746  
Year End Allocation 48.50% 47.60%  
Pension Plans | Fixed Income | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ (2)  
Pension Plans | Fixed Income | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1,823 1,748  
Pension Plans | Fixed Income | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Fixed Income | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | United States Government and Agency Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 1,060 $ 864  
Year End Allocation 28.20% 23.60%  
Pension Plans | United States Government and Agency Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ (2)  
Pension Plans | United States Government and Agency Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1,060 866  
Pension Plans | United States Government and Agency Securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | United States Government and Agency Securities | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Corporate Debt      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 627 $ 719  
Year End Allocation 16.70% 19.60%  
Pension Plans | Corporate Debt | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
Pension Plans | Corporate Debt | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 627 719  
Pension Plans | Corporate Debt | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Corporate Debt | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Foreign Debt      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 110 $ 136  
Year End Allocation 2.90% 3.70%  
Pension Plans | Foreign Debt | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
Pension Plans | Foreign Debt | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 110 136  
Pension Plans | Foreign Debt | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Foreign Debt | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | State and Local Government      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 21 $ 26  
Year End Allocation 0.60% 0.70%  
Pension Plans | State and Local Government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
Pension Plans | State and Local Government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 21 26  
Pension Plans | State and Local Government | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | State and Local Government | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Other – Asset Backed      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 5 $ 1  
Year End Allocation 0.10% 0.00%  
Pension Plans | Other – Asset Backed | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
Pension Plans | Other – Asset Backed | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 5 1  
Pension Plans | Other – Asset Backed | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Other – Asset Backed | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Infrastructure      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 114 $ 113  
Year End Allocation 3.00% 3.10%  
Pension Plans | Infrastructure | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
Pension Plans | Infrastructure | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Infrastructure | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Infrastructure | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 114 113  
Pension Plans | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 221 $ 228  
Year End Allocation 5.90% 6.20%  
Pension Plans | Real Estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
Pension Plans | Real Estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Real Estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Real Estate | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 221 228  
Pension Plans | Alternative Investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 218 $ 224  
Year End Allocation 5.80% 6.10%  
Pension Plans | Alternative Investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
Pension Plans | Alternative Investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Alternative Investments | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Alternative Investments | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 218 224  
Pension Plans | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 47 $ 68  
Year End Allocation 1.30% 1.90%  
Pension Plans | Cash and Cash Equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
Pension Plans | Cash and Cash Equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 18 41  
Pension Plans | Cash and Cash Equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Cash and Cash Equivalents | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 29 27  
Pension Plans | Other Pending Transactions and Accrued Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 30 $ 21  
Year End Allocation 0.80% 0.60%  
Pension Plans | Other Pending Transactions and Accrued Income | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
Pension Plans | Other Pending Transactions and Accrued Income | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Other Pending Transactions and Accrued Income | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
Pension Plans | Other Pending Transactions and Accrued Income | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 30 21  
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 1,980 $ 1,776 $ 1,673
Year End Allocation 100.00% 100.00%  
OPEB | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 1,081 $ 1,033  
OPEB | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 578 463  
OPEB | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 321 280  
OPEB | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 1,256 $ 1,078  
Year End Allocation 63.50% 60.60%  
OPEB | Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 969 $ 948  
OPEB | Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Equities | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 287 130  
OPEB | Domestic      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 643 $ 617  
Year End Allocation 32.50% 34.70%  
OPEB | Domestic | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 643 $ 617  
OPEB | Domestic | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Domestic | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Domestic | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 241 $ 267  
Year End Allocation 12.20% 15.00%  
OPEB | International | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 241 $ 267  
OPEB | International | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | International | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | International | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Common Collective Trusts      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 372 $ 194  
Year End Allocation 18.80% 10.90%  
OPEB | Common Collective Trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 85 $ 64  
OPEB | Common Collective Trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Common Collective Trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Common Collective Trusts | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 287 130  
OPEB | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 522 $ 512  
Year End Allocation 26.30% 28.90%  
OPEB | Fixed Income | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 84 $ 57  
OPEB | Fixed Income | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 438 322  
OPEB | Fixed Income | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Fixed Income | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 133  
OPEB | Common Collective Trust - Debt      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   $ 133  
Year End Allocation   7.50%  
OPEB | Common Collective Trust - Debt | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   $ 0  
OPEB | Common Collective Trust - Debt | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   0  
OPEB | Common Collective Trust - Debt | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   0  
OPEB | Common Collective Trust - Debt | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   133  
OPEB | United States Government and Agency Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 265 $ 157  
Year End Allocation 13.40% 8.90%  
OPEB | United States Government and Agency Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ (1)  
OPEB | United States Government and Agency Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 265 158  
OPEB | United States Government and Agency Securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | United States Government and Agency Securities | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Corporate Debt      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 141 $ 132  
Year End Allocation 7.10% 7.50%  
OPEB | Corporate Debt | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
OPEB | Corporate Debt | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 141 132  
OPEB | Corporate Debt | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Corporate Debt | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Foreign Debt      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 26 $ 27  
Year End Allocation 1.30% 1.50%  
OPEB | Foreign Debt | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
OPEB | Foreign Debt | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 26 27  
OPEB | Foreign Debt | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Foreign Debt | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | State and Local Government      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 88 $ 63  
Year End Allocation 4.40% 3.50%  
OPEB | State and Local Government | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 84 $ 58  
OPEB | State and Local Government | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 4 5  
OPEB | State and Local Government | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | State and Local Government | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Other – Asset Backed      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 2    
Year End Allocation 0.10%    
OPEB | Other – Asset Backed | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0    
OPEB | Other – Asset Backed | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 2    
OPEB | Other – Asset Backed | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0    
OPEB | Other – Asset Backed | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0    
OPEB | Trusted Owned Life Insurance      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 140 $ 141  
Year End Allocation 7.10% 8.00%  
OPEB | Trusted Owned Life Insurance | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
OPEB | Trusted Owned Life Insurance | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 140 141  
OPEB | Trusted Owned Life Insurance | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Trusted Owned Life Insurance | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | International Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 30 $ 23  
Year End Allocation 1.50% 1.30%  
OPEB | International Equities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
OPEB | International Equities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 30 23  
OPEB | International Equities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | International Equities | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | United States Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 110 $ 118  
Year End Allocation 5.60% 6.70%  
OPEB | United States Bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
OPEB | United States Bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 110 118  
OPEB | United States Bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | United States Bonds | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 28 $ 31  
Year End Allocation 1.40% 1.70%  
OPEB | Cash and Cash Equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 28 $ 28  
OPEB | Cash and Cash Equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Cash and Cash Equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Cash and Cash Equivalents | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 3  
OPEB | Other Pending Transactions and Accrued Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 34 $ 14  
Year End Allocation 1.70% 0.80%  
OPEB | Other Pending Transactions and Accrued Income | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 0 $ 0  
OPEB | Other Pending Transactions and Accrued Income | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Other Pending Transactions and Accrued Income | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
OPEB | Other Pending Transactions and Accrued Income | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 34 $ 14