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Securities - Aggregate Fair Value of Investments with Continuous Unrealized Loss Position (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value $ 57,701,000,000 $ 60,585,000,000
Less than 12 months Unrealized losses 623,000,000 860,000,000
12 months or more Fair value 6,108,000,000 4,229,000,000
12 months or more Unrealized losses 234,000,000 274,000,000
Total Fair value 63,809,000,000 64,814,000,000
Total Unrealized losses 857,000,000 1,134,000,000
AOCI, transfers from AFS to HTM Securities, gross unrealized losses, greater than 12 months 168,000,000 190,000,000
AOCI, transfers from AFS to HTM Securities, gross unrealized losses, less than 12 months 0 0
Securities available-for-sale    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 28,990,000,000 32,802,000,000
Less than 12 months Unrealized losses 354,000,000 506,000,000
12 months or more Fair value 5,793,000,000 3,952,000,000
12 months or more Unrealized losses 227,000,000 265,000,000
Total Fair value 34,783,000,000 36,754,000,000
Total Unrealized losses 581,000,000 771,000,000
Securities available-for-sale | U.S. Treasury    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 8,023,000,000 8,489,000,000
Less than 12 months Unrealized losses 123,000,000 181,000,000
12 months or more Fair value 0 0
12 months or more Unrealized losses 1,000,000 0
Total Fair value 8,023,000,000 8,489,000,000
Total Unrealized losses 124,000,000 181,000,000
Securities available-for-sale | U.S. government agencies    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 286,000,000 257,000,000
Less than 12 months Unrealized losses 5,000,000 9,000,000
12 months or more Fair value 0 0
12 months or more Unrealized losses 0 0
Total Fair value 286,000,000 257,000,000
Total Unrealized losses 5,000,000 9,000,000
Securities available-for-sale | State and political subdivisions    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 589,000,000 1,058,000,000
Less than 12 months Unrealized losses 12,000,000 33,000,000
12 months or more Fair value 129,000,000 131,000,000
12 months or more Unrealized losses 18,000,000 19,000,000
Total Fair value 718,000,000 1,189,000,000
Total Unrealized losses 30,000,000 52,000,000
Securities available-for-sale | Agency RMBS    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 10,592,000,000 14,766,000,000
Less than 12 months Unrealized losses 98,000,000 141,000,000
12 months or more Fair value 4,376,000,000 1,673,000,000
12 months or more Unrealized losses 184,000,000 200,000,000
Total Fair value 14,968,000,000 16,439,000,000
Total Unrealized losses 282,000,000 341,000,000
Securities available-for-sale | Non-agency RMBS    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 4,000,000 21,000,000
Less than 12 months Unrealized losses 0 0
12 months or more Fair value 279,000,000 332,000,000
12 months or more Unrealized losses 6,000,000 13,000,000
Total Fair value 283,000,000 353,000,000
Total Unrealized losses 6,000,000 13,000,000
Securities available-for-sale | Other RMBS    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 0 26,000,000
Less than 12 months Unrealized losses 0 0
12 months or more Fair value 95,000,000 136,000,000
12 months or more Unrealized losses 6,000,000 8,000,000
Total Fair value 95,000,000 162,000,000
Total Unrealized losses 6,000,000 8,000,000
Securities available-for-sale | Commercial MBS    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 249,000,000 302,000,000
Less than 12 months Unrealized losses 5,000,000 7,000,000
12 months or more Fair value 81,000,000 163,000,000
12 months or more Unrealized losses 2,000,000 4,000,000
Total Fair value 330,000,000 465,000,000
Total Unrealized losses 7,000,000 11,000,000
Securities available-for-sale | Agency commercial MBS    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 3,422,000,000 3,570,000,000
Less than 12 months Unrealized losses 55,000,000 78,000,000
12 months or more Fair value 540,000,000 589,000,000
12 months or more Unrealized losses 7,000,000 6,000,000
Total Fair value 3,962,000,000 4,159,000,000
Total Unrealized losses 62,000,000 84,000,000
Securities available-for-sale | CLOs    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 679,000,000 443,000,000
Less than 12 months Unrealized losses 3,000,000 1,000,000
12 months or more Fair value 25,000,000 404,000,000
12 months or more Unrealized losses 0 0
Total Fair value 704,000,000 847,000,000
Total Unrealized losses 3,000,000 1,000,000
Securities available-for-sale | Other asset-backed securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 174,000,000 276,000,000
Less than 12 months Unrealized losses 0 1,000,000
12 months or more Fair value 147,000,000 357,000,000
12 months or more Unrealized losses 1,000,000 5,000,000
Total Fair value 321,000,000 633,000,000
Total Unrealized losses 1,000,000 6,000,000
Securities available-for-sale | Corporate bonds    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 491,000,000 594,000,000
Less than 12 months Unrealized losses 11,000,000 16,000,000
12 months or more Fair value 8,000,000 7,000,000
12 months or more Unrealized losses 0 1,000,000
Total Fair value 499,000,000 601,000,000
Total Unrealized losses 11,000,000 17,000,000
Securities available-for-sale | Sovereign debt/sovereign guaranteed    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 2,107,000,000 1,521,000,000
Less than 12 months Unrealized losses 23,000,000 20,000,000
12 months or more Fair value 58,000,000 63,000,000
12 months or more Unrealized losses 0 0
Total Fair value 2,165,000,000 1,584,000,000
Total Unrealized losses 23,000,000 20,000,000
Securities available-for-sale | Non-agency RMBS    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 5,000,000 25,000,000
Less than 12 months Unrealized losses 0 0
12 months or more Fair value 30,000,000 47,000,000
12 months or more Unrealized losses 2,000,000 9,000,000
Total Fair value 35,000,000 72,000,000
Total Unrealized losses 2,000,000 9,000,000
Securities available-for-sale | Other debt securities    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 1,226,000,000 742,000,000
Less than 12 months Unrealized losses 10,000,000 10,000,000
12 months or more Fair value 25,000,000 50,000,000
12 months or more Unrealized losses 0 0
Total Fair value 1,251,000,000 792,000,000
Total Unrealized losses 10,000,000 10,000,000
Securities available-for-sale | Foreign covered bonds    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 1,143,000,000 712,000,000
Less than 12 months Unrealized losses 9,000,000 9,000,000
12 months or more Fair value 0 0
12 months or more Unrealized losses 0 0
Total Fair value 1,143,000,000 712,000,000
Total Unrealized losses 9,000,000 9,000,000
Held-to-maturity    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 28,711,000,000 27,783,000,000
Less than 12 months Unrealized losses 269,000,000 354,000,000
12 months or more Fair value 315,000,000 277,000,000
12 months or more Unrealized losses 7,000,000 9,000,000
Total Fair value 29,026,000,000 28,060,000,000
Total Unrealized losses 276,000,000 363,000,000
Held-to-maturity | U.S. Treasury    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 7,533,000,000 6,112,000,000
Less than 12 months Unrealized losses 31,000,000 41,000,000
12 months or more Fair value 0 0
12 months or more Unrealized losses 0 0
Total Fair value 7,533,000,000 6,112,000,000
Total Unrealized losses 31,000,000 41,000,000
Held-to-maturity | U.S. government agencies    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 1,558,000,000 1,533,000,000
Less than 12 months Unrealized losses 7,000,000 6,000,000
12 months or more Fair value 0 0
12 months or more Unrealized losses 0 0
Total Fair value 1,558,000,000 1,533,000,000
Total Unrealized losses 7,000,000 6,000,000
Held-to-maturity | State and political subdivisions    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value   0
Less than 12 months Unrealized losses   0
12 months or more Fair value   4,000,000
12 months or more Unrealized losses   1,000,000
Total Fair value   4,000,000
Total Unrealized losses 0 1,000,000
Held-to-maturity | Agency RMBS    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 19,045,000,000 19,498,000,000
Less than 12 months Unrealized losses 225,000,000 297,000,000
12 months or more Fair value 163,000,000 102,000,000
12 months or more Unrealized losses 3,000,000 2,000,000
Total Fair value 19,208,000,000 19,600,000,000
Total Unrealized losses 228,000,000 299,000,000
Held-to-maturity | Non-agency RMBS    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 3,000,000 4,000,000
Less than 12 months Unrealized losses 0 0
12 months or more Fair value 41,000,000 48,000,000
12 months or more Unrealized losses 2,000,000 2,000,000
Total Fair value 44,000,000 52,000,000
Total Unrealized losses 2,000,000 2,000,000
Held-to-maturity | Other RMBS    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 0 15,000,000
Less than 12 months Unrealized losses 0 0
12 months or more Fair value 111,000,000 123,000,000
12 months or more Unrealized losses 2,000,000 4,000,000
Total Fair value 111,000,000 138,000,000
Total Unrealized losses 2,000,000 4,000,000
Held-to-maturity | Commercial MBS    
Investments, Unrealized Loss Position [Line Items]    
Total Unrealized losses 0 0
Held-to-maturity | Agency commercial MBS    
Investments, Unrealized Loss Position [Line Items]    
Less than 12 months Fair value 572,000,000 621,000,000
Less than 12 months Unrealized losses 6,000,000 10,000,000
12 months or more Fair value 0 0
12 months or more Unrealized losses 0 0
Total Fair value 572,000,000 621,000,000
Total Unrealized losses 6,000,000 10,000,000
Held-to-maturity | Sovereign debt/sovereign guaranteed    
Investments, Unrealized Loss Position [Line Items]    
Total Unrealized losses 0 0
Held-to-maturity | Other debt securities    
Investments, Unrealized Loss Position [Line Items]    
Total Unrealized losses 0 0
Held-to-maturity | Foreign covered bonds    
Investments, Unrealized Loss Position [Line Items]    
Total Unrealized losses $ 0 $ 0