v3.25.3
Derivative Financial Instruments - Schedule of Outstanding Hedges: (Notional Amount) (Details) - USD ($)
$ in Millions
Sep. 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 $ 80,367 $ 47,222
Derivatives not designated as hedging instruments | Foreign exchange contracts | Futures    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 98 359
Derivatives not designated as hedging instruments | Foreign exchange contracts | Forward, swap and spot    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 2,836,639 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 827 466
Derivatives not designated as hedging instruments | Foreign exchange contracts | Options written    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 144 145
Derivatives not designated as hedging instruments | Other derivative contracts | Futures    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 148 155
Derivatives not designated as hedging instruments | Other derivative contracts | Stable value contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 15,857 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 251 253
Derivatives designated as hedging instruments | Interest rate contracts | Swap agreements    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments 40,567 33,302
Derivatives designated as hedging instruments | Foreign exchange contracts | Forward and swap    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional amount of derivative instruments $ 12,473 $ 10,260