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Securities - Schedule of Held to Maturity Securities Recognized and Not Recognized in Other Comprehensive Income (OCI) and Fair Values (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Securities held to maturity    
Held to Maturity Securities Amortized Cost $ 10,538 $ 11,038
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income 1 1
Total, Unrealized Losses, Recognized in OCI 130 138
Held-to-maturity Securities 10,409 10,901
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 63 30
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 141 211
Securities held to maturity 10,331 10,720
U.S. Treasury    
Securities held to maturity    
Held to Maturity Securities Amortized Cost 427 528
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income 0 0
Total, Unrealized Losses, Recognized in OCI 0 0
Held-to-maturity Securities 427 528
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 1 1
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 1 2
Securities held to maturity 427 527
U.S. government agency and government-sponsored agencies - residential mortgage-backed securities    
Securities held to maturity    
Held to Maturity Securities Amortized Cost 7,840 8,302
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income 1 1
Total, Unrealized Losses, Recognized in OCI 92 96
Held-to-maturity Securities 7,749 8,207
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 39 11
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 122 191
Securities held to maturity 7,666 8,027
U.S. government agency and government-sponsored agencies - commercial mortgage-backed securities    
Securities held to maturity    
Held to Maturity Securities Amortized Cost 1,421 1,486
Held To Maturity Securities Unrealized Holding Gain Recognized in Other Comprehensive Income 0 0
Total, Unrealized Losses, Recognized in OCI 38 42
Held-to-maturity Securities 1,383 1,444
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 23 17
Securities held to maturity, Gross Unrealized Losses, Not Recognized in OCI 18 18
Securities held to maturity $ 1,388 $ 1,443