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Shareholders' equity AOCI Reclassifications (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Equity, Class of Treasury Stock [Line Items]        
Interest expense $ 197 $ 192 $ 559 $ 552
Income tax expense (787) (504) (1,825) (1,336)
Net income 3,107 2,490 7,449 7,000
Reclassification out of Accumulated Other Comprehensive Income        
Equity, Class of Treasury Stock [Line Items]        
Net income (47) 29 48 (101)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Including Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income        
Equity, Class of Treasury Stock [Line Items]        
Income tax expense (11) 17 17 41
Net income (42) (23) (140) (113)
Debt Securities, Available-for-Sale, Realized Gain (Loss) (31) (40) (157) (154)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income        
Equity, Class of Treasury Stock [Line Items]        
Interest expense 8 5 23 11
Income tax expense (2) (1) (5) (2)
Net income 6 4 18 9
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income        
Equity, Class of Treasury Stock [Line Items]        
Foreign Currency Transaction Gain (Loss), Realized (9) 63 229 14
Interest expense (5) (3) (14) (11)
Income tax expense 3 (12) (45) 0
Net income $ (11) $ 48 $ 170 $ 3