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Securities - Details of Securities (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | $ 34,003 | $ 26,810
Gross Unrealized Gains | 595 | 804
Gross Unrealized Losses | 675 | 58
Fair Value | 33,923 | 27,556
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 6,857 | 7,595
Gross Unrealized Gains | 302 | 428
Gross Unrealized Losses | 0 | 0
Fair Value | 7,159 | 8,023
Accrued interest | 242 | 241
U.S. Treasury, agencies and corporations |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 4,914 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 13 | 0
Fair Value | 4,901 | 1,000
States and political subdivisions |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 0 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 0 | 0
Agency residential collateralized mortgage obligations |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 14,419 | 14,001
Gross Unrealized Gains | 249 | 297
Gross Unrealized Losses | 219 | 25
Fair Value | 14,449 | 14,273
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 3,312 | 3,775
Gross Unrealized Gains | 107 | 124
Gross Unrealized Losses | 0 | 0
Fair Value | 3,419 | 3,899
Agency residential mortgage-backed securities |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 4,018 | 2,094
Gross Unrealized Gains | 57 | 70
Gross Unrealized Losses | 49 | 0
Fair Value | 4,026 | 2,164
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 238 | 271
Gross Unrealized Gains | 9 | 14
Gross Unrealized Losses | 0 | 0
Fair Value | 247 | 285
Asset-backed securities |  |
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 16 | 19
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 16 | 19
Other securities |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 8 | 8
Gross Unrealized Gains | 14 | 5
Gross Unrealized Losses |  | 0
Fair Value | 22 | 13
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 16 | 15
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 16 | 15
Mortgage-backed securities | Agency commercial mortgage-backed securities |  |
SECURITIES AVAILABLE FOR SALE |  |
Amortized Cost | 10,644 | 9,707
Gross Unrealized Gains | 275 | 432
Gross Unrealized Losses | 394 | 33
Fair Value | 10,525 | 10,106
HELD-TO-MATURITY SECURITIES |  |
Amortized Cost | 3,275 | 3,515
Gross Unrealized Gains | 186 | 290
Gross Unrealized Losses | 0 | 0
Fair Value | 3,461 | 3,805
Securities available for sale |  |
HELD-TO-MATURITY SECURITIES |  |
Accrued interest | 49 | 42
Securities held-to-maturity |  |
HELD-TO-MATURITY SECURITIES |  |
Accrued interest | $ 14 | $ 15

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