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Investment Securities (Investment Table) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, fair value $ 29,181 $ 30,284
Debt securities, held-to-maturity, amortized cost 1,497 1,568
Held-to-maturity securities, fair value $ 1,580 1,600
Document Period End Date Mar. 31, 2020  
Available-for-sale securities    
Schedule of Investments [Line Items]    
Securities pledged for Federal Home Loan Bank, at fair value $ 3,000 1,900
Securities, amount eligible to be repledged or sold by counterparty 668 118
Operating Segments | Insurance operations | Available-for-sale securities    
Schedule of Investments [Line Items]    
Deposit securities 12 12
US Treasury | Available-for-sale securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, amortized cost 785 2,059
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 21 6
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 0 (17)
Debt securities, available-for-sale, fair value 806 2,048
US States and political subdivisions | Available-for-sale securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, amortized cost 691 623
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 20 19
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (2) (1)
Debt securities, available-for-sale, fair value 709 641
Foreign government | Available-for-sale securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, amortized cost 175 184
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 5 3
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 0 (1)
Debt securities, available-for-sale, fair value 180 186
Agency mortgage-backed residential    
Schedule of Investments [Line Items]    
Debt securities, held-to-maturity, amortized cost 1,480  
Agency mortgage-backed residential | Available-for-sale securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, amortized cost 20,702 21,183
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 831 257
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 0 (36)
Debt securities, available-for-sale, fair value 21,533 21,404
Agency mortgage-backed residential | Held-to-maturity securities    
Schedule of Investments [Line Items]    
Debt securities, held-to-maturity, amortized cost 1,480 1,547
Debt securities, held-to-maturity, unrecognized gain 83 38
Debt securities, held-to-maturity, unrecognized loss 0 (6)
Held-to-maturity securities, fair value 1,563 1,579
Mortgage-backed residential | Available-for-sale securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, amortized cost 2,968 2,841
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 34 20
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (54) (11)
Debt securities, available-for-sale, fair value 2,948 2,850
Agency mortgage-backed commercial | Available-for-sale securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, amortized cost 1,333 1,344
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 114 44
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax 0 (6)
Debt securities, available-for-sale, fair value 1,447 1,382
Mortgage-backed commercial | Available-for-sale securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, amortized cost 41 41
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 0 1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (4) 0
Debt securities, available-for-sale, fair value 37 42
Asset-backed    
Schedule of Investments [Line Items]    
Debt securities, held-to-maturity, amortized cost 17  
Asset-backed | Available-for-sale securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, amortized cost 333 365
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 0 3
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (4) 0
Debt securities, available-for-sale, fair value 329 368
Asset-backed | Held-to-maturity securities    
Schedule of Investments [Line Items]    
Debt securities, held-to-maturity, amortized cost 17 21
Debt securities, held-to-maturity, unrecognized gain 0 0
Debt securities, held-to-maturity, unrecognized loss 0 0
Held-to-maturity securities, fair value 17 21
Corporate debt | Available-for-sale securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, amortized cost 1,203 1,327
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 16 37
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (27) (1)
Debt securities, available-for-sale, fair value 1,192 1,363
Available-for-sale debt securities | Available-for-sale securities    
Schedule of Investments [Line Items]    
Debt securities, available-for-sale, amortized cost 28,231 29,967
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax 1,041 390
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax (91) (73)
Debt securities, available-for-sale, fair value 29,181 30,284
Accrued interest receivable 90 98
Held-to-maturity securities    
Schedule of Investments [Line Items]    
Debt securities, held-to-maturity, amortized cost 1,497 1,568
Debt securities, held-to-maturity, unrecognized gain 83 38
Debt securities, held-to-maturity, unrecognized loss 0 (6)
Held-to-maturity securities, fair value 1,580 1,600
Accrued interest receivable 3 3
Federal Home Loan Bank certificates and obligations | Held-to-maturity securities    
Schedule of Investments [Line Items]    
Securities pledged for Federal Home Loan Bank, at fair value $ 1,200 $ 915