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Securities - Schedule of Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Securities available for sale    
Less than 12 months, Fair Value $ 7,857 $ 4,677
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 83 49
12 months or more, Fair Value 4,563 9,295
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 62 358
Fair Value, Total 12,420 13,972
Unrealized Losses, Total 145 407
US Treasury and Government [Member]    
Securities available for sale    
Less than 12 months, Fair Value 4,407 147
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 48 1
12 months or more, Fair Value 543 3,182
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 5 143
Fair Value, Total 4,950 3,329
Unrealized Losses, Total 53 144
U.S. government agency and government-sponsored agencies    
Securities available for sale    
Less than 12 months, Fair Value 914 1,941
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4 8
12 months or more, Fair Value 2,769 4,797
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 32 160
Fair Value, Total 3,683 6,738
Unrealized Losses, Total 36 168
Privately issued    
Securities available for sale    
Less than 12 months, Fair Value 127 398
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 7
12 months or more, Fair Value 155 383
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2 16
Fair Value, Total 282 781
Unrealized Losses, Total 2 23
Privately issued - commercial mortgage-backed securities    
Securities available for sale    
Less than 12 months, Fair Value 1,669 380
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 28 6
12 months or more, Fair Value 12 515
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 15
Fair Value, Total 1,681 895
Unrealized Losses, Total 28 21
Collateralized loan obligations    
Securities available for sale    
Less than 12 months, Fair Value 597 1,428
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2 18
12 months or more, Fair Value 790 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 6 0
Fair Value, Total 1,387 1,428
Unrealized Losses, Total 8 18
Direct bank purchase bonds    
Securities available for sale    
Less than 12 months, Fair Value 118 221
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 6
12 months or more, Fair Value 294 417
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 17 24
Fair Value, Total 412 638
Unrealized Losses, Total 18 30
Other    
Securities available for sale    
Less than 12 months, Fair Value 25 162
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 3
12 months or more, Fair Value 0 1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Fair Value, Total 25 163
Unrealized Losses, Total $ 0 $ 3