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AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI, Net of Tax [Roll Forward]        
Beginning balance     $ 65,189  
Amounts reclassified from AOCI:        
Total OCI, net of tax $ (379) $ 357 (947) $ 1,320
Ending balance 64,095   64,095  
Total        
AOCI, Net of Tax [Roll Forward]        
Beginning balance (6,337) (7,250) (5,769) (8,213)
OCI before reclassifications, net of tax (463) 280 (1,094) 1,187
Amounts reclassified from AOCI:        
Total OCI, net of tax (379) 357 (947) 1,320
Ending balance (6,716) (6,893) (6,716) (6,893)
Total | Amounts reclassified from AOCI        
Amounts reclassified from AOCI:        
Before tax 111 98 193 171
Tax effect 27 21 46 38
Amounts reclassified, net of tax 84 77 147 133
Pension and OPEB Costs        
AOCI, Net of Tax [Roll Forward]        
Beginning balance (387) (643) (381) (648)
OCI before reclassifications, net of tax 1 1 (7) 6
Amounts reclassified from AOCI:        
Total OCI, net of tax 1 2 (5) 7
Ending balance (386) (641) (386) (641)
Pension and OPEB Costs | Amounts reclassified from AOCI        
Amounts reclassified from AOCI:        
Before tax 1 1 3 1
Tax effect 1 0 1 0
Amounts reclassified, net of tax 0 1 2 1
Cash Flow Hedges        
AOCI, Net of Tax [Roll Forward]        
Beginning balance (572) (432) (173) (861)
OCI before reclassifications, net of tax (505) 205 (932) 563
Amounts reclassified from AOCI:        
Total OCI, net of tax (463) 275 (862) 704
Ending balance (1,035) (157) (1,035) (157)
Cash Flow Hedges | Amounts reclassified from AOCI        
Amounts reclassified from AOCI:        
Before tax 54 92 91 185
Tax effect 12 22 21 44
Amounts reclassified, net of tax 42 70 70 141
AFS Securities        
AOCI, Net of Tax [Roll Forward]        
Beginning balance (3,517) (4,095) (3,306) (4,573)
OCI before reclassifications, net of tax 39 69 (158) 612
Amounts reclassified from AOCI:        
Total OCI, net of tax 31 16 (180) 494
Ending balance (3,486) (4,079) (3,486) (4,079)
AFS Securities | Amounts reclassified from AOCI        
Amounts reclassified from AOCI:        
Before tax (11) (66) (29) (151)
Tax effect (3) (13) (7) (33)
Amounts reclassified, net of tax (8) (53) (22) (118)
HTM Securities        
AOCI, Net of Tax [Roll Forward]        
Beginning balance (1,862) (2,075) (1,909) (2,125)
OCI before reclassifications, net of tax 0 0 0 0
Amounts reclassified from AOCI:        
Total OCI, net of tax 50 59 97 109
Ending balance (1,812) (2,016) (1,812) (2,016)
HTM Securities | Amounts reclassified from AOCI        
Amounts reclassified from AOCI:        
Before tax 67 71 128 136
Tax effect 17 12 31 27
Amounts reclassified, net of tax 50 59 97 109
Other, net        
AOCI, Net of Tax [Roll Forward]        
Beginning balance 1 (5) 0 (6)
OCI before reclassifications, net of tax 2 5 3 6
Amounts reclassified from AOCI:        
Total OCI, net of tax 2 5 3 6
Ending balance 3 0 3 0
Other, net | Amounts reclassified from AOCI        
Amounts reclassified from AOCI:        
Before tax 0 0 0 0
Tax effect 0 0 0 0
Amounts reclassified, net of tax $ 0 $ 0 $ 0 $ 0