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Accumulated Other Comprehensive Income (Loss), Net of Tax - Schedule of Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance $ 16,671 $ 15,824 $ 16,114 $ 15,477 $ 15,477
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 (1) 5 2  
Other Comprehensive Income (Loss), net of tax 11 31 21 37  
Ending Balance 17,009 16,095 17,009 16,095 16,114
Cash Flow Hedges [Member]          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance 23 20 36 3 3
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 (5) (12) 17 42
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (1) (3) (2) (8) (9)
Other Comprehensive Income (Loss), net of tax (1) (8) (14) 9  
Ending Balance 22 12 22 12 36
Pension and OPEB Plans [Member]          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance (73) (98) (76) (102) (102)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0 0 0  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 1 2 4 6  
Other Comprehensive Income (Loss), net of tax 1 2 4 6  
Ending Balance (72) (96) (72) (96) (76)
Available-for-Sale Securities [Member]          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance (73) (95) (93) (80) (80)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 11 37 28 18  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 0 3 4  
Other Comprehensive Income (Loss), net of tax 11 37 31 22  
Ending Balance (62) (58) (62) (58) (93)
AOCI Attributable to Parent [Member]          
Accumulated Other Comprehensive Income (Loss) [Roll Forward]          
Beginning Balance (123) (173) (133) (179) (179)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 11 (32) 16 35  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 0 (1) 5 2  
Other Comprehensive Income (Loss), net of tax 11 31 21 37  
Ending Balance $ (112) $ (142) $ (112) $ (142) $ (133)