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Investment Securities (Investment Portfolio) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Available-for-sale securities    
Fair value [1] $ 33,587 $ 29,830
Held-to-maturity securities    
Amortized cost 1,170 1,253
Available-for-sale securities    
Held-to-maturity securities    
Securities pledged for Federal Home Loan Bank, at fair value 203 145
Operating Segments | Insurance operations | Available-for-sale securities    
Held-to-maturity securities    
Deposit securities 13 13
Available-for-sale debt securities | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 33,650 28,936
Gross unrealized gains 358 915
Gross unrealized losses (421) (21)
Fair value 33,587 29,830
Held-to-maturity securities    
Debt securities, available-for-sale, accrued interest receivable 84 90
U.S. Treasury and federal agencies | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 2,173 783
Gross unrealized gains 2 20
Gross unrealized losses (20) 0
Fair value 2,155 803
U.S. States and political subdivisions | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 841 1,046
Gross unrealized gains 27 50
Gross unrealized losses (4) (1)
Fair value 864 1,095
Foreign government | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 157 167
Gross unrealized gains 2 9
Gross unrealized losses (2) 0
Fair value 157 176
Agency mortgage-backed securities    
Held-to-maturity securities    
Amortized cost 1,170 1,253
Agency mortgage-backed securities | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 19,044 18,053
Gross unrealized gains 219 538
Gross unrealized losses (224) (3)
Fair value 19,039 18,588
Agency mortgage-backed securities | Held-to-maturity securities    
Held-to-maturity securities    
Amortized cost 1,170 1,253
Gross unrealized gains 48 79
Gross unrealized losses (14) (1)
Fair value 1,204 1,331
Mortgage-backed residential | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 4,448 2,595
Gross unrealized gains 11 49
Gross unrealized losses (34) (4)
Fair value 4,425 2,640
Agency mortgage-backed commercial | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 4,573 4,063
Gross unrealized gains 66 139
Gross unrealized losses (113) (13)
Fair value 4,526 4,189
Asset-backed | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 536 420
Gross unrealized gains 1 5
Gross unrealized losses (3) 0
Fair value 534 425
Corporate debt | Available-for-sale securities    
Available-for-sale securities    
Amortized cost 1,878 1,809
Gross unrealized gains 30 105
Gross unrealized losses (21) 0
Fair value 1,887 1,914
Held-to-maturity securities    
Held-to-maturity securities    
Amortized cost 1,170 1,253
Gross unrealized gains 48 79
Gross unrealized losses (14) (1)
Fair value 1,204 1,331
Debt securities, held-to-maturity, accrued interest receivable 3 3
Held-to-maturity securities | Held-to-maturity securities    
Held-to-maturity securities    
Fair value $ 1,204 $ 1,331
[1] Refer to Note 8 for discussion of investment securities pledged as collateral.