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Total Equity and Other Comprehensive Income (Accumulated Other Comprehensive Income (Loss) Components) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, beginning balance $ 57,655 $ 52,681 $ 54,469 $ 51,141
Other comprehensive income (loss), net of tax 605 2,356 2,488 2,622
Equity, ending balance 59,038 55,729 59,038 55,729
Pretax loss included in AOCI from derivatives 255 280 255 280
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, beginning balance (4,682) (7,446) (6,565) (7,712)
Other comprehensive income (loss), net of tax 605 2,356 2,488 2,622
Equity, ending balance (4,077) (5,090) (4,077) (5,090)
Debt securities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, beginning balance (4,197) (5,605) (5,099) (5,830)
Other comprehensive income (loss), net of tax 505 1,232 1,407 1,457
Equity, ending balance (3,692) (4,373) (3,692) (4,373)
Cash flow hedge derivatives        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, beginning balance (322) (1,669) (1,314) (1,713)
Other comprehensive income (loss), net of tax 102 1,121 1,094 1,165
Equity, ending balance (220) (548) (220) (548)
Pension and other postretirement benefit plan adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, beginning balance (125) (126) (109) (125)
Other comprehensive income (loss), net of tax 1 0 (15) (1)
Equity, ending balance (124) (126) (124) (126)
Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Equity, beginning balance (38) (46) (43) (44)
Other comprehensive income (loss), net of tax (3) 3 2 1
Equity, ending balance $ (41) $ (43) $ (41) $ (43)