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Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 13,766 $ 12,859
Net change (173) 283
Ending balance 13,657 13,378
Accumulated other comprehensive loss    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (3,816) (4,059)
Net change (173) 283
Ending balance (3,989) (3,776)
Available-for-sale securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (3,146) (4,095)
Net change (171) 284
Ending balance (3,317) (3,811)
Held-to-maturity securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (682) 0
Net change 15 0
Ending balance (667) 0
Translation adjustments and net investment hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 21 18
Net change (1) 0
Ending balance 20 18
Cash flow hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (9) 18
Net change (16) (1)
Ending balance $ (25) $ 17