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Investment Securities (Investment Portfolio) (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Available-for-sale securities    
Fair value [1] $ 33,385 $ 33,587
Held-to-maturity securities    
Amortized cost 1,159 1,170
Available-for-sale securities    
Held-to-maturity securities    
Securities pledged for Federal Home Loan Bank, at fair value 227 203
Operating Segments | Insurance operations | Available-for-sale securities    
Held-to-maturity securities    
Deposit securities 12 13
Available-for-sale debt securities | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 35,592 33,650
Gross unrealized gains 31 358
Gross unrealized losses (2,238) (421)
Fair value 33,385 33,587
Held-to-maturity securities    
Debt securities, available-for-sale, accrued interest receivable 88 84
U.S. Treasury and federal agencies | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 2,517 2,173
Gross unrealized gains 0 2
Gross unrealized losses (130) (20)
Fair value 2,387 2,155
U.S. States and political subdivisions | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 886 841
Gross unrealized gains 3 27
Gross unrealized losses (47) (4)
Fair value 842 864
Foreign government | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 161 157
Gross unrealized gains 0 2
Gross unrealized losses (8) (2)
Fair value 153 157
Agency mortgage-backed securities    
Held-to-maturity securities    
Amortized cost 1,159 1,170
Agency mortgage-backed securities | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 20,100 19,044
Gross unrealized gains 12 219
Gross unrealized losses (1,178) (224)
Fair value 18,934 19,039
Agency mortgage-backed securities | Held-to-maturity securities    
Held-to-maturity securities    
Amortized cost 1,159 1,170
Gross unrealized gains 8 48
Gross unrealized losses (61) (14)
Fair value 1,106 1,204
Mortgage-backed residential | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 5,158 4,448
Gross unrealized gains 1 11
Gross unrealized losses (320) (34)
Fair value 4,839 4,425
Agency mortgage-backed commercial | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 4,371 4,573
Gross unrealized gains 12 66
Gross unrealized losses (433) (113)
Fair value 3,950 4,526
Asset-backed | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 499 536
Gross unrealized gains 0 1
Gross unrealized losses (16) (3)
Fair value 483 534
Corporate debt | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 1,900 1,878
Gross unrealized gains 3 30
Gross unrealized losses (106) (21)
Fair value 1,797 1,887
Held-to-maturity securities    
Held-to-maturity securities    
Amortized cost 1,159 1,170
Gross unrealized gains 8 48
Gross unrealized losses (61) (14)
Fair value 1,106 1,204
Debt securities, held-to-maturity, accrued interest receivable 2 3
Held-to-maturity securities | Held-to-maturity securities    
Held-to-maturity securities    
Fair value $ 1,106 $ 1,204
[1] Refer to Note 7 for discussion of cash and cash equivalents and investment securities pledged as collateral.