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Derivative Financial Instruments - Hedging Programs (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
instrument
Dec. 31, 2023
USD ($)
instrument
Jun. 18, 2024
USD ($)
Net Investment Hedging      
Derivative Financial Instruments      
Notional amount $ 6,900,000,000 $ 4,900,000,000  
Average remaining maturity 9 months 18 days 1 month 6 days  
Interest Rate Swap | Fair Value Hedging      
Derivative Financial Instruments      
Notional amount $ 6,700,000,000 $ 6,700,000,000  
Average remaining maturity 4 years 8 months 12 days 5 years 6 months  
Interest Rate Swap | Cash Flow Hedging      
Derivative Financial Instruments      
Notional amount $ 0 $ 0  
Forward-starting interest rate swaps | Cash Flow Hedging      
Derivative Financial Instruments      
Number of derivative instruments outstanding | instrument 0 0  
Net gains (losses) before taxes in accumulated other comprehensive income/(loss), cash flow hedges $ (110,000,000) $ (121,000,000)  
Gains (losses) expected to be reclassified to net income within the next 12 months (14,000,000)    
Foreign exchange contracts      
Derivative Financial Instruments      
Gains (losses) expected to be reclassified to net income within the next 12 months (63,000,000)    
Foreign exchange contracts | Not Designated as Hedging Instrument, Economic Hedge      
Derivative Financial Instruments      
Notional amount $ 5,700,000,000 6,700,000,000  
Foreign exchange contracts | Not Designated as Hedging Instrument, Economic Hedge | Maximum      
Derivative Financial Instruments      
Term of contract 1 year    
Foreign exchange contracts | Cash Flow Hedging      
Derivative Financial Instruments      
Notional amount $ 5,000,000,000.0 5,200,000,000  
Net gains (losses) before taxes in accumulated other comprehensive income/(loss), cash flow hedges $ (4,000,000) 23,000,000  
Maximum length of time hedged 6 years    
Foreign exchange contracts | Net Investment Hedging      
Derivative Financial Instruments      
Notional amount $ 15,100,000,000 15,900,000,000  
Foreign Exchange Forward      
Derivative Financial Instruments      
Notional amount     $ 1,800,000,000
Foreign Exchange Forward | Cash Flow Hedging      
Derivative Financial Instruments      
Notional amount $ 9,800,000,000 $ 9,200,000,000  
Average remaining maturity 6 months 7 months 6 days  
Net gains (losses) before taxes in accumulated other comprehensive income/(loss), cash flow hedges $ (105,000,000) $ 40,000,000  
Gains (losses) expected to be reclassified to net income within the next 12 months $ (160,000,000)    
Maximum length of time hedged 2 years    
Currency Swap | Cash Flow Hedging      
Derivative Financial Instruments      
Net gains (losses) before taxes in accumulated other comprehensive income/(loss), cash flow hedges $ (51,000,000) (68,000,000)  
Gains (losses) expected to be reclassified to net income within the next 12 months (16,000,000)    
Currency Swap | Net Investment Hedging      
Derivative Financial Instruments      
Notional amount 2,200,000,000    
Equity contracts hedging employee compensation obligations | Not Designated as Hedging Instrument, Economic Hedge      
Derivative Financial Instruments      
Notional amount $ 1,400,000,000 $ 1,200,000,000