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Investment Securities - Summary of Unrealized Loss Positions on Investment Securities (Details)
$ in Millions
Sep. 30, 2021
USD ($)
securities
Dec. 31, 2020
USD ($)
securities
Agency - Commercial    
Fair Value    
Unrealized Loss Position with Duration 12 Months and Over $ 4 $ 3
Unrealized Loss Position with Duration Under 12 Months $ 11 $ 7
Number of Securities    
Unrealized Loss Position with Duration 12 Months and Over | securities 2 1
Unrealized Loss Position with Duration Under 12 Months | securities 4 2
Unrealized Loss    
Unrealized Loss Position with Duration 12 Months and Over $ 0 $ 0
Unrealized Loss Position with Duration Under 12 Months 0 0
Agency - Residential    
Fair Value    
Unrealized Loss Position with Duration 12 Months and Over 0 0
Unrealized Loss Position with Duration Under 12 Months $ 274 $ 0
Number of Securities    
Unrealized Loss Position with Duration 12 Months and Over | securities 0 0
Unrealized Loss Position with Duration Under 12 Months | securities 13 1
Unrealized Loss    
Unrealized Loss Position with Duration 12 Months and Over $ 0 $ 0
Unrealized Loss Position with Duration Under 12 Months (2) 0
Fair Value    
Unrealized Loss Position with Duration 12 Months and Over 0 0
Unrealized Loss Position with Duration Under 12 Months $ 0 $ 2
Number of Securities    
Unrealized Loss Position with Duration 12 Months and Over | securities 0 0
Unrealized Loss Position with Duration Under 12 Months | securities 1 3
Unrealized Loss    
Unrealized Loss Position with Duration 12 Months and Over $ 0 $ 0
Unrealized Loss Position with Duration Under 12 Months 0 0
Corporate debt obligations    
Fair Value    
Unrealized Loss Position with Duration 12 Months and Over 0 0
Unrealized Loss Position with Duration Under 12 Months $ 3 $ 10
Number of Securities    
Unrealized Loss Position with Duration 12 Months and Over | securities 0 0
Unrealized Loss Position with Duration Under 12 Months | securities 1 3
Unrealized Loss    
Unrealized Loss Position with Duration 12 Months and Over $ 0 $ 0
Unrealized Loss Position with Duration Under 12 Months 0 0
Other mortgage-backed securities    
Fair Value    
Unrealized Loss Position with Duration 12 Months and Over 0 0
Unrealized Loss Position with Duration Under 12 Months $ 32 $ 0
Number of Securities    
Unrealized Loss Position with Duration 12 Months and Over | securities 1 0
Unrealized Loss Position with Duration Under 12 Months | securities 3 1
Unrealized Loss    
Unrealized Loss Position with Duration 12 Months and Over $ 0 $ 0
Unrealized Loss Position with Duration Under 12 Months $ 0 $ 0