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Shareholders' equity AOCI Reclassifications (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Equity, Class of Treasury Stock [Line Items]        
Interest expense $ 174 $ 150 $ 499 $ 416
Income Tax (Expense) Benefit (413) (263) (1,189) (907)
Net income (loss) 2,043 792 5,728 3,935
Reclassification out of Accumulated Other Comprehensive Income        
Equity, Class of Treasury Stock [Line Items]        
Net income (loss) (86) (265) (315) (744)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income        
Equity, Class of Treasury Stock [Line Items]        
Debt Securities, Available-for-sale, Realized Gain (70) (279) (357) (857)
Income Tax (Expense) Benefit 25 39 (59) (138)
Net income (loss) (45) (240) (298) (719)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income        
Equity, Class of Treasury Stock [Line Items]        
Foreign Currency Transaction Gain (Loss), Realized (51) (32) (20) (32)
Interest expense (4) 0 (12) 0
Income Tax (Expense) Benefit 12 (7) (7) (7)
Net income (loss) (43) (25) (25) (25)
Cumulative Foreign Currency Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income        
Equity, Class of Treasury Stock [Line Items]        
Interest expense 3 0 10 0
Income Tax (Expense) Benefit (1) 0 2 0
Net income (loss) $ 2 $ 0 $ 8 $ 0