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Investments (Schedule of Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Investment Holdings [Line Items]    
Available-for-sale investment securities, amortized cost [1] $ 10,016 $ 10,173
Available-for-sale investment securities, gross unrealized gains [1] 487 158
Available-for-sale investment securities, gross unrealized losses [1] 0 (8)
Available-for-sale investment securities, fair value [1] 10,503 10,323
Held-to-maturity investment securities, amortized cost [2] 279 272
Held-to-maturity investment securities, gross unrealized gains [2] 9 3
Held-to-maturity investment securities, gross unrealized losses [2] 0 (1)
Held-to-maturity investment securities, fair value [2] 288 274
U.S. Treasury Securities [Member]    
Investment Holdings [Line Items]    
Available-for-sale investment securities, amortized cost [1] 9,634 9,759
Available-for-sale investment securities, gross unrealized gains [1] 476 155
Available-for-sale investment securities, gross unrealized losses [1] 0 (8)
Available-for-sale investment securities, fair value [1] 10,110 9,906
Residential Mortgage-Backed Securities - Agency [Member]    
Investment Holdings [Line Items]    
Available-for-sale investment securities, amortized cost [1] 382 [3] 414
Available-for-sale investment securities, gross unrealized gains [1] 11 3
Available-for-sale investment securities, gross unrealized losses [1] 0 0
Available-for-sale investment securities, fair value [1] 393 [3] 417
Held-to-maturity investment securities, amortized cost [2],[4] 279 [3] 272
Held-to-maturity investment securities, gross unrealized gains [2],[4] 9 3
Held-to-maturity investment securities, gross unrealized losses [2],[4] 0 (1)
Held-to-maturity investment securities, fair value [2],[4] $ 288 [3] $ 274
[1]
Available-for-sale investment securities are reported at fair value.
[2]
Held-to-maturity investment securities are reported at amortized cost.
[3]
Maturities of residential mortgage-backed securities are reflective of the contractual maturities of the investment.
[4]
Amounts represent residential mortgage-backed securities that were classified as held-to-maturity as they were entered into as a part of the Company's community reinvestment initiatives.