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Securities - Details of Securities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | $ 21,692 | $ 19,917
Gross Unrealized Gains | 266 | 55
Gross Unrealized Losses | 115 | 544
Fair Value | 21,843 | 19,428
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 10,067 | 11,519
Gross Unrealized Gains | 107 | 4
Gross Unrealized Losses | 58 | 401
Fair Value | 10,116 | 11,122
U.S. Treasury, Agencies, and Corporations [Member] |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 334 | 150
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 3
Fair Value | 334 | 147
State and municpal bonds [Member] |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 4 | 7
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 4 | 7
Collateralized Mortgage Obligations [Member] |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 12,772 | 14,315
Gross Unrealized Gains | 82 | 20
Gross Unrealized Losses | 71 | 373
Fair Value | 12,783 | 13,962
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 5,692 | 7,021
Gross Unrealized Gains | 23 | 2
Gross Unrealized Losses | 49 | 254
Fair Value | 5,666 | 6,769
Residential Mortgage Backed Securities [Member] |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 1,677 | 2,128
Gross Unrealized Gains | 41 | 13
Gross Unrealized Losses | 4 | 36
Fair Value | 1,714 | 2,105
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 409 | 490
Gross Unrealized Gains | 6 | 0
Gross Unrealized Losses | 0 | 14
Fair Value | 415 | 476
Asset-backed Securities [Member] |  |
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 11 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 11 | 0
Other Securities [Member] |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 7 | 17
Gross Unrealized Gains | 4 | 3
Gross Unrealized Losses | 0 | 0
Fair Value | 11 | 20
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 15 | 12
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 15 | 12
Other Mortgage-Backed Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 6,898 | 3,300
Gross Unrealized Gains | 139 | 19
Gross Unrealized Losses | 40 | 132
Fair Value | 6,997 | 3,187
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 3,940 | 3,996
Gross Unrealized Gains | 78 | 2
Gross Unrealized Losses | 9 | 133
Fair Value | $ 4,009 | $ 3,865

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