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Investment Securities (Investment Portfolio) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Available-for-sale securities    
Amortized cost $ 35,521 $ 33,650
Gross unrealized gains 5 358
Gross unrealized losses (3,783) (421)
Fair value [1] 31,743 33,587
Held-to-maturity securities    
Amortized cost 1,112 1,170
Gross unrealized gains 0 48
Gross unrealized losses (114) (14)
Fair value 998 1,204
Debt securities, available-for-sale, accrued interest receivable 90 84
Debt securities, held-to-maturity, accrued interest receivable 3 3
Asset Pledged as Collateral with Right    
Available-for-sale securities    
Fair value 3,700 203
Held-to-maturity securities    
Securities with the right to sell or pledge 304 203
Operating Segments | Insurance operations    
Held-to-maturity securities    
Deposit securities 12 13
U.S. Treasury and federal agencies    
Available-for-sale securities    
Amortized cost 2,561 2,173
Gross unrealized gains 0 2
Gross unrealized losses (187) (20)
Fair value 2,374 2,155
U.S. States and political subdivisions    
Available-for-sale securities    
Amortized cost 859 841
Gross unrealized gains 1 27
Gross unrealized losses (72) (4)
Fair value 788 864
Foreign government    
Available-for-sale securities    
Amortized cost 161 157
Gross unrealized gains 0 2
Gross unrealized losses (12) (2)
Fair value 149 157
Agency mortgage-backed securities    
Available-for-sale securities    
Amortized cost 19,956 19,044
Gross unrealized gains 1 219
Gross unrealized losses (2,098) (224)
Fair value 17,859 19,039
Held-to-maturity securities    
Amortized cost 1,112 1,170
Gross unrealized gains 0 48
Gross unrealized losses (114) (14)
Fair value 998 1,204
Mortgage-backed residential    
Available-for-sale securities    
Amortized cost 5,249 4,448
Gross unrealized gains 0 11
Gross unrealized losses (595) (34)
Fair value 4,654 4,425
Agency mortgage-backed commercial    
Available-for-sale securities    
Amortized cost 4,343 4,573
Gross unrealized gains 3 66
Gross unrealized losses (616) (113)
Fair value 3,730 4,526
Asset-backed    
Available-for-sale securities    
Amortized cost 496 536
Gross unrealized gains 0 1
Gross unrealized losses (21) (3)
Fair value 475 534
Corporate debt    
Available-for-sale securities    
Amortized cost 1,896 1,878
Gross unrealized gains 0 30
Gross unrealized losses (182) (21)
Fair value $ 1,714 $ 1,887
[1] Refer to Note 7 for discussion of investment securities pledged as collateral.