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Derivatives (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Derivatives, Fair Value [Line Items]          
Maximum Amount of Future Payments under Credit Default Swaps $ 13,059   $ 13,059   $ 8,626
Estimated Fair Value Assets 14,193   14,193   10,466
Estimated Fair Value Liabilities 8,185   8,185   3,852
Excess securities collateral received on derivatives 950   950   $ 172
Collateral Amount Not Provided Due to Downgrade Threshold 15   15    
Derivative Instrument Detail [Abstract]          
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges 19 $ 6 $ 21 $ 5  
Hedging exposure to variability in future cash flows for specific length of time     7 years   7 years
Accumulated Other Comprehensive Income Loss 3,900   $ 3,900   $ 2,100
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges 618   618   303
Excess securities collateral provided on derivatives 127   127   126
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged 0   0    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months     372    
Nonperformance Risk [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives gains (losses) 39 $ 3 43 $ (48)  
Over the Counter [Member]          
Derivatives, Fair Value [Line Items]          
Excess securities collateral received on derivatives (283)   (283)   (160)
Excess securities collateral provided on derivatives (1,400)   (1,400)   (243)
Cash collateral on derivative assets (7,344)   (7,344)   (6,948)
Exchange-traded          
Derivatives, Fair Value [Line Items]          
Excess securities collateral provided on derivatives (136)   (136)   (185)
Cash collateral on derivative assets 0   0   0
Exchange Cleared [Member]          
Derivatives, Fair Value [Line Items]          
Excess securities collateral received on derivatives (942)   (942)   (1,200)
Cash collateral on derivative assets 0   0   (421)
Accrued Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Estimated Fair Value Assets 187   187   130
Estimated Fair Value Liabilities $ 34   $ 34   $ (23)