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Investment Securities (Summary) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale debt securities, amortized cost $ 86,224.0 $ 67,790.0
Securities available for sale debt securities, unrealized gains 3,233.0 1,471.0
Securities available for sale debt securities, unrealized losses (380.0) (98.0)
Investment securities – available for sale 89,077.0 69,163.0
Held to maturity securities, amortized cost [1] 1,469.0 17,661.0
Held-to-maturity securities, unrealized gains 176.0 423.0
Held-to-maturity securities, unrealized losses (24.0) (40.0)
Held-to-maturity securities, fair value 1,621.0 18,044.0
Debt securities, available-for-sale, accrued interest 266.0  
Debt securities, held-to-maturity, accrued interest 2.7  
Debt securities, available-for-sale, allowance for credit loss $ 2.0  
Credit Concentration Risk [Member] | Fitch, AAA or AA Rating [Member]    
Debt Securities, Held-to-maturity [Abstract]    
Concentration risk, percentage 87.00%  
US Treasury and Government [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale debt securities, amortized cost $ 16,102.0 16,150.0
Securities available for sale debt securities, unrealized gains 879.0 382.0
Securities available for sale debt securities, unrealized losses   (16.0)
Investment securities – available for sale 16,981.0 16,516.0
Held to maturity securities, amortized cost 781.0 776.0
Held-to-maturity securities, unrealized gains 143.0 56.0
Held-to-maturity securities, fair value 924.0 832.0
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale debt securities, amortized cost 50,828.0 35,847.0
Securities available for sale debt securities, unrealized gains 1,810.0 517.0
Securities available for sale debt securities, unrealized losses (10.0) (43.0)
Investment securities – available for sale 52,628.0 36,321.0
Held to maturity securities, amortized cost   14,419.0
Held-to-maturity securities, unrealized gains   270.0
Held-to-maturity securities, unrealized losses   (26.0)
Held-to-maturity securities, fair value   14,663.0
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale debt securities, amortized cost 1,563.0 1,515.0
Securities available for sale debt securities, unrealized gains 142.0 302.0
Securities available for sale debt securities, unrealized losses (62.0) (3.0)
Investment securities – available for sale 1,643.0 1,814.0
Held to maturity securities, amortized cost   133.0
Held-to-maturity securities, unrealized gains   7.0
Held-to-maturity securities, fair value   140.0
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale debt securities, amortized cost 3,181.0 3,094.0
Securities available for sale debt securities, unrealized gains 114.0 42.0
Securities available for sale debt securities, unrealized losses (6.0) (18.0)
Investment securities – available for sale 3,289.0 3,118.0
Held to maturity securities, amortized cost   59.0
Held-to-maturity securities, unrealized gains   1.0
Held-to-maturity securities, fair value   60.0
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Non-agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale debt securities, amortized cost 4,249.0 3,352.0
Securities available for sale debt securities, unrealized gains 27.0 29.0
Securities available for sale debt securities, unrealized losses (194.0) (9.0)
Investment securities – available for sale 4,082.0 3,372.0
Held to maturity securities, amortized cost   430.0
Held-to-maturity securities, unrealized gains   4.0
Held-to-maturity securities, fair value   434.0
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale debt securities, amortized cost 5,339.0 5,044.0
Securities available for sale debt securities, unrealized gains 43.0 78.0
Securities available for sale debt securities, unrealized losses (104.0) (8.0)
Investment securities – available for sale 5,278.0 5,114.0
Held to maturity securities, amortized cost 50.0 52.0
Held-to-maturity securities, unrealized gains  
Held-to-maturity securities, unrealized losses (1.0)  
Held-to-maturity securities, fair value 49.0 52.0
Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Securities available for sale debt securities, amortized cost 4,962.0 2,788.0
Securities available for sale debt securities, unrealized gains 218.0 121.0
Securities available for sale debt securities, unrealized losses (4.0) (1.0)
Investment securities – available for sale 5,176.0 2,908.0
Held to maturity securities, amortized cost 638.0 1,792.0
Held-to-maturity securities, unrealized gains 33.0 85.0
Held-to-maturity securities, unrealized losses (23.0) (14.0)
Held-to-maturity securities, fair value $ 648.0 $ 1,863.0
[1]
Amounts as of March 31, 2020 are net of the related Allowances for Credit Losses recorded in accordance with the adoption of Accounting Standards Update 2016-13, Financial Instruments - Credit Losses, which totaled $2 million and $19 million for Investment securities and Other assets, respectively. See Recently Adopted Accounting Standards portion of Note 1 Accounting Policies for additional detail on the adoption of this ASU.