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Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive loss at beginning of period     $ 9,230  
Accumulated other comprehensive loss at end of period $ 9,260   9,260  
Income Tax Expense (Benefit) (17) $ (9) 0 $ 0
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive loss at beginning of period (20) (21) (20) (21)
Net current period other comprehensive loss 0 0 0 0
Accumulated other comprehensive loss at end of period (20) (21) (20) (21)
Gains and Losses on Cash Flow Hedges | Interest Rate Swap        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Losses reclassified from net accumulated other comprehensive loss [1] 0 0 0 0
Defined Benefit and Postretirement Items        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive loss at beginning of period (1) (1) (2) (1)
Net current period other comprehensive loss 0 0 1 0
Accumulated other comprehensive loss at end of period (1) (1) (1) (1)
Defined Benefit and Postretirement Items | Interest Rate Swap        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Losses reclassified from net accumulated other comprehensive loss [1] 0 0 (1) 0
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated other comprehensive loss at beginning of period (21) (22) (22) (22)
Net current period other comprehensive loss 0 0 1 0
Accumulated other comprehensive loss at end of period (21) (22) (21) (22)
Total | Interest Rate Swap        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Losses reclassified from net accumulated other comprehensive loss [1] $ 0 $ 0 $ (1) $ 0
[1] Included in the computation of net periodic pension and postretirement benefit costs. See Note 8 for further information.