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Derivative Financial Instruments - Hedging Programs (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Mar. 31, 2021
Interest rate swaps | Derivative instruments in fair value hedges      
Derivative Financial Instruments      
Notional amount $ 400 $ 3,000  
Amount of terminated derivative     $ 1,250
Average remaining maturity 1 year 6 months 1 year 2 months 12 days  
Interest rate swaps | Derivative instruments in cash flow hedges      
Derivative Financial Instruments      
Notional amount $ 0 $ 0  
Foreign exchange contracts | Not designated as hedging instruments - economic hedges      
Derivative Financial Instruments      
Notional amount $ 7,800 6,800  
Foreign exchange contracts | Not designated as hedging instruments - economic hedges | Maximum      
Derivative Financial Instruments      
Term of contract 1 year    
Foreign exchange contracts | Instruments in net investment hedges      
Derivative Financial Instruments      
Aggregate amount of debt issued $ 15,500 16,400  
Notional amount $ 7,500 $ 7,200  
Average remaining maturity 1 month 6 days 3 months 18 days  
Foreign exchange forward contracts | Derivative instruments in cash flow hedges      
Derivative Financial Instruments      
Maximum length of time hedged 2 years 10 months 24 days    
Notional amount $ 7,500 $ 8,000  
Average remaining maturity 7 months 6 days 8 months 12 days  
Net gains (losses) before taxes in accumulated other comprehensive income/(loss), cash flow hedges $ 294 $ (192)  
Gains (losses) expected to be reclassified to net income within the next 12 months $ 216    
Cross-currency swaps | Derivative instruments in cash flow hedges      
Derivative Financial Instruments      
Maximum length of time hedged 6 years 4 months 24 days    
Notional amount $ 1,500 1,500  
Net gains (losses) before taxes in accumulated other comprehensive income/(loss), cash flow hedges (191) $ (236)  
Gains (losses) expected to be reclassified to net income within the next 12 months $ (25)    
Forward-starting interest rate swaps | Derivative instruments in cash flow hedges      
Derivative Financial Instruments      
Number of derivative instruments outstanding 0 0  
Net gains (losses) before taxes in accumulated other comprehensive income/(loss), cash flow hedges $ (161) $ (174)  
Gains (losses) expected to be reclassified to net income within the next 12 months (18)    
Equity contracts hedging employee compensation obligations | Not designated as hedging instruments - economic hedges      
Derivative Financial Instruments      
Notional amount $ 1,400 $ 1,300