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Derivative Instruments (Fair Value Hedge Cumulative) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged Asset, Fair Value Hedge $ 0 $ 89
Interest Rate Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged Liability, Fair Value Hedge (970) (25)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) (43) (1)
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (23) 1
Other Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged Liability, Fair Value Hedge (672) 0
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) (32) 0
Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) $ (25) $ 0