Quarterly report pursuant to Section 13 or 15(d)

Securities - Debt Securities (Details)

v3.10.0.1
Securities - Debt Securities (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Available-for-sale Debt Securities:    
Amortized Cost $ 269,848 $ 304,671
Gross Unrealized Gains 584 1,078
Gross Unrealized Losses (8,313) (3,118)
Fair Value 262,119 302,631
Other Debt Securities, Carried at Fair Value:    
Amortized Cost 12,853 12,273
Gross Unrealized Gains 306 252
Gross Unrealized Losses (22) (39)
Fair Value 13,137 12,486
Debt securities carried at fair value:    
Amortized Cost 282,701 316,944
Gross Unrealized Gains 890 1,330
Gross Unrealized Losses (8,335) (3,157)
Debt securities carried at fair value 275,256 315,117
Held-to-maturity Securities:    
Amortized Cost 163,013 125,013
Gross Unrealized Gains 131 111
Gross Unrealized Losses (4,913) (1,825)
Held-to-maturity, fair value 158,231 123,299
Debt securities:    
Amortized Cost 445,714 441,957
Gross Unrealized Gains 1,021 1,441
Gross Unrealized Losses (13,248) (4,982)
Fair Value 433,487 438,416
Available-for-sale Equity Securities:    
Availabl-for-sale debt securities reclassified to held to maturity 25,000  
Securities, pledged as collateral 42,400 35,800
Nonperforming Financing Receivable    
Available-for-sale Debt Securities:    
Fair Value 92 99
FNMA    
Debt securities carried at fair value:    
Amortized Cost 165,600 163,600
Debt securities carried at fair value 160,600 162,100
FHLMC    
Debt securities carried at fair value:    
Amortized Cost 52,800 50,300
Debt securities carried at fair value 51,200 50,000
Other assets    
Available-for-sale Equity Securities:    
Amortized Cost   27
Gross Unrealized Gains   0
Gross Unrealized Losses   (2)
Fair Value   25
Mortgage-backed securities    
Available-for-sale Debt Securities:    
Amortized Cost 184,934 217,239
Gross Unrealized Gains 402 840
Gross Unrealized Losses (6,167) (1,993)
Fair Value 179,169 216,086
Other Debt Securities, Carried at Fair Value:    
Fair Value 2,535 2,769
Debt securities carried at fair value:    
Debt securities carried at fair value 181,704  
Agency    
Available-for-sale Debt Securities:    
Amortized Cost 162,301 194,119
Gross Unrealized Gains 125 506
Gross Unrealized Losses (5,426) (1,696)
Fair Value 157,000 192,929
Debt securities carried at fair value:    
Debt securities carried at fair value 157,000  
Agency-collateralized mortgage obligations    
Available-for-sale Debt Securities:    
Amortized Cost 6,194 6,846
Gross Unrealized Gains 13 39
Gross Unrealized Losses (172) (81)
Fair Value 6,035 6,804
Other Debt Securities, Carried at Fair Value:    
Fair Value 0 5
Debt securities carried at fair value:    
Debt securities carried at fair value 6,035  
Commercial    
Available-for-sale Debt Securities:    
Amortized Cost 14,156 13,864
Gross Unrealized Gains 2 28
Gross Unrealized Losses (558) (208)
Fair Value 13,600 13,684
Debt securities carried at fair value:    
Debt securities carried at fair value 13,600  
Non-agency residential    
Available-for-sale Debt Securities:    
Amortized Cost 2,283 2,410
Gross Unrealized Gains 262 267
Gross Unrealized Losses (11) (8)
Fair Value 2,534 2,669
Other Debt Securities, Carried at Fair Value:    
Fair Value 2,535 $ 2,764
Debt securities carried at fair value:    
Debt securities carried at fair value $ 5,069  
Non-agency residential | Prime    
Available-for-sale Equity Securities:    
Available-for-sale securities, percent held by rating 62.00% 62.00%
Non-agency residential | Alt-A    
Available-for-sale Equity Securities:    
Available-for-sale securities, percent held by rating 13.00% 13.00%
Non-agency residential | Subprime    
Available-for-sale Equity Securities:    
Available-for-sale securities, percent held by rating 25.00% 25.00%
U.S. Treasury and agency securities    
Available-for-sale Debt Securities:    
Amortized Cost $ 54,758 $ 54,523
Gross Unrealized Gains 12 18
Gross Unrealized Losses (2,036) (1,018)
Fair Value 52,734 53,523
Debt securities carried at fair value:    
Debt securities carried at fair value 52,734  
Non-U.S. securities    
Available-for-sale Debt Securities:    
Amortized Cost 6,659 6,669
Gross Unrealized Gains 7 9
Gross Unrealized Losses (1) (1)
Fair Value 6,665 6,677
Other Debt Securities, Carried at Fair Value:    
Fair Value 10,400 9,488
Debt securities carried at fair value:    
Debt securities carried at fair value 17,065  
Other taxable securities, substantially all asset-backed securities    
Available-for-sale Debt Securities:    
Amortized Cost 4,412 5,699
Gross Unrealized Gains 81 73
Gross Unrealized Losses (7) (2)
Fair Value 4,486 5,770
Other Debt Securities, Carried at Fair Value:    
Fair Value 202 229
Debt securities carried at fair value:    
Debt securities carried at fair value 4,688  
Total taxable securities    
Available-for-sale Debt Securities:    
Amortized Cost 250,763 284,130
Gross Unrealized Gains 502 940
Gross Unrealized Losses (8,211) (3,014)
Fair Value 243,054 282,056
Debt securities carried at fair value:    
Debt securities carried at fair value 256,191  
Tax-exempt securities    
Available-for-sale Debt Securities:    
Amortized Cost 19,085 20,541
Gross Unrealized Gains 82 138
Gross Unrealized Losses (102) (104)
Fair Value 19,065 $ 20,575
Debt securities carried at fair value:    
Debt securities carried at fair value 19,065  
Debt securities    
Debt securities carried at fair value:    
Debt securities carried at fair value $ 275,256