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Securities - Schedule of Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Securities available for sale    
Less than 12 months, Fair Value $ 4,677 $ 5,561
Less than 12 months, Unrealized Losses 50 44
12 months or more, Fair Value 9,295 7,586
12 months or more, Unrealized Losses 357 245
Fair Value, Total 13,972 13,147
Unrealized Losses, Total 407 289
U.S. Treasury    
Securities available for sale    
Less than 12 months, Fair Value 147 1,074
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 14
12 months or more, Fair Value 3,182 2,128
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 143 104
Fair Value, Total 3,329 3,202
Unrealized Losses, Total 144 118
U.S. government agency and government-sponsored agencies    
Securities available for sale    
Less than 12 months, Fair Value 1,941 3,606
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 8 22
12 months or more, Fair Value 4,797 4,651
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 160 110
Fair Value, Total 6,738 8,257
Unrealized Losses, Total 168 132
Privately issued    
Securities available for sale    
Less than 12 months, Fair Value 398 275
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7 1
12 months or more, Fair Value 383 164
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 16 3
Fair Value, Total 781 439
Unrealized Losses, Total 23 4
Privately issued - commercial mortgage-backed securities    
Securities available for sale    
Less than 12 months, Fair Value 364 447
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 6 3
12 months or more, Fair Value 512 80
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 14 2
Fair Value, Total 876 527
Unrealized Losses, Total 20 5
Collateralized loan obligations    
Securities available for sale    
Less than 12 months, Fair Value 1,428 12
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 18 0
12 months or more, Fair Value 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Fair Value, Total 1,428 12
Unrealized Losses, Total 18 0
Asset Liability Management securities    
Securities available for sale    
Less than 12 months, Fair Value 4,278 5,414
Less than 12 months, Unrealized Losses 40 40
12 months or more, Fair Value 8,874 7,023
12 months or more, Unrealized Losses 333 219
Fair Value, Total 13,152 12,437
Unrealized Losses, Total 373 259
Direct bank purchase bonds    
Securities available for sale    
Less than 12 months, Fair Value 221 58
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 6 4
12 months or more, Fair Value 417 563
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 24 26
Fair Value, Total 638 621
Unrealized Losses, Total 30 30
Other    
Securities available for sale    
Less than 12 months, Fair Value 178 79
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4 0
12 months or more, Fair Value 4 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Fair Value, Total 182 79
Unrealized Losses, Total $ 4 0
Equity securities    
Securities available for sale    
Less than 12 months, Fair Value   10
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   0
12 months or more, Fair Value   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   0
Fair Value, Total   10
Unrealized Losses, Total   $ 0