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Investment Securities (Investment Portfolio) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Available-for-sale securities    
Debt securities, available-for-sale, fair value [1] $ 34,161 $ 29,830
Held-to-maturity securities    
Debt securities, held-to-maturity, amortized cost 1,126 1,253
Available-for-sale securities    
Held-to-maturity securities    
Securities pledged for Federal Home Loan Bank, at fair value 151 145
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    
Debt securities, available-for-sale, amortized cost 33,781 28,936
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 596 915
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (216) (21)
Debt securities, available-for-sale, fair value 34,161 29,830
Held-to-maturity securities    
Accrued interest receivable 90 90
U.S. Treasury and federal agencies | Available-for-sale securities    
Available-for-sale securities    
Debt securities, available-for-sale, amortized cost 2,153 783
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 12 20
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (17) 0
Debt securities, available-for-sale, fair value 2,148 803
U.S. States and political subdivisions | Available-for-sale securities    
Available-for-sale securities    
Debt securities, available-for-sale, amortized cost 989 1,046
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 37 50
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (2) (1)
Debt securities, available-for-sale, fair value 1,024 1,095
Foreign government | Available-for-sale securities    
Available-for-sale securities    
Debt securities, available-for-sale, amortized cost 181 167
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 4 9
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (1) 0
Debt securities, available-for-sale, fair value 184 176
Agency mortgage-backed residential    
Held-to-maturity securities    
Debt securities, held-to-maturity, amortized cost 1,126 1,253
Agency mortgage-backed residential | Available-for-sale securities    
Available-for-sale securities    
Debt securities, available-for-sale, amortized cost 20,615 18,053
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 343 538
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (123) (3)
Debt securities, available-for-sale, fair value 20,835 18,588
Agency mortgage-backed residential | Held-to-maturity securities    
Held-to-maturity securities    
Debt securities, held-to-maturity, amortized cost 1,126 1,253
Debt securities, held-to-maturity, unrecognized gain 57 79
Debt securities, held-to-maturity, unrecognized loss (10) (1)
Held-to-maturity securities, fair value 1,173 1,331
Mortgage-backed residential | Available-for-sale securities    
Available-for-sale securities    
Debt securities, available-for-sale, amortized cost 2,890 2,595
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 25 49
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (5) (4)
Debt securities, available-for-sale, fair value 2,910 2,640
Agency mortgage-backed commercial | Available-for-sale securities    
Available-for-sale securities    
Debt securities, available-for-sale, amortized cost 4,355 4,063
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 109 139
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (59) (13)
Debt securities, available-for-sale, fair value 4,405 4,189
Asset-backed | Available-for-sale securities    
Available-for-sale securities    
Debt securities, available-for-sale, amortized cost 552 420
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 3 5
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 0 0
Debt securities, available-for-sale, fair value 555 425
Corporate debt | Available-for-sale securities    
Available-for-sale securities    
Debt securities, available-for-sale, amortized cost 2,046 1,809
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 63 105
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (9) 0
Debt securities, available-for-sale, fair value 2,100 1,914
Held-to-maturity securities    
Held-to-maturity securities    
Debt securities, held-to-maturity, amortized cost 1,126 1,253
Debt securities, held-to-maturity, unrecognized gain 57 79
Debt securities, held-to-maturity, unrecognized loss (10) (1)
Held-to-maturity securities, fair value 1,173 1,331
Accrued interest receivable 3 3
Held-to-maturity securities | Held-to-maturity securities    
Held-to-maturity securities    
Held-to-maturity securities, fair value $ 1,173 $ 1,331
[1] Refer to Note 6 for discussion of investment securities pledged as collateral.