v3.25.2
Derivative Financial Instruments - Schedule of Outstanding Hedges: (Notional Amount) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Derivatives not designated as hedging instruments | Interest rate contracts | Futures    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments $ 64,124 $ 47,222
Derivatives not designated as hedging instruments | Foreign exchange contracts | Futures    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 754 359
Derivatives not designated as hedging instruments | Foreign exchange contracts | Forward, swap and spot    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 3,046,843 2,612,945
Derivatives not designated as hedging instruments | Foreign exchange contracts | Options purchased    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 625 466
Derivatives not designated as hedging instruments | Foreign exchange contracts | Options written    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 172 145
Derivatives not designated as hedging instruments | Other derivative contracts | Futures    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 112 155
Derivatives not designated as hedging instruments | Other derivative contracts | Stable value contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 18,894 25,271
Derivatives not designated as hedging instruments | Other derivative contracts | Deferred value awards    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 279 253
Derivatives designated as hedging instruments | Interest rate contracts | Swap agreements    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 41,540 33,302
Derivatives designated as hedging instruments | Foreign exchange contracts | Forward and swap    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments $ 11,056 $ 10,260