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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Investment Securities The following table presents our AFS and HTM investment securities:
Amortized CostGross Unrealized
Gains		Gross Unrealized
Losses		Fair Value
 (Dollars in millions)
June 30, 2020
Available-for-sale securities
Agency - Commercial$1,208  $46  $—  $1,254  
Agency - Residential899  33  —  932  
Municipal obligations30  1  —  31  
Corporate debt obligations76  1  (1) 76  
Other MBS54  —  —  54  
Certificate of deposits1  —  —  1  
Total available-for-sale securities (1)$2,268  $81  $(1) $2,348  
Held-to-maturity securities
Agency - Commercial $244  $8  $—  $252  
Agency - Residential 252  12  —  264  
Total held-to-maturity securities (1)$496  $20  $—  $516  
December 31, 2019
Available-for-sale securities
Agency - Commercial$948  $2  $(3) $947  
Agency - Residential1,015  4  (4) 1,015  
Corporate debt obligations76  1  —  77  
Municipal obligations 31  —  —  31  
Other MBS44  1  —  45  
Certificate of Deposits 1  —  —  1  
Total available-for-sale securities (1)$2,115  $8  $(7) $2,116  
Held-to-maturity securities
Agency - Commercial $306  $—  $(1) $305  
Agency - Residential 292  3  (1) 294  
Total held-to-maturity securities (1)$598  $3  $(2) $599  
(1)There were no securities of a single issuer, which are not governmental or government-sponsored, that exceeded 10 percent of stockholders’ equity at June 30, 2020 or December 31, 2019.
Summary of Unrealized Loss Positions on Investment Securities - Held-to-Maturity
The following table summarizes the unrealized loss positions on available-for-sale and held-to-maturity investment securities, by duration of the unrealized loss: 
 Unrealized Loss Position with
Duration 12 Months and Over		Unrealized Loss Position with
Duration Under 12 Months
Fair ValueNumber of SecuritiesUnrealized LossFair
Value		Number of
Securities		Unrealized
Loss
(Dollars in millions)
June 30, 2020
Available-for-sale securities
Agency - Commercial$4  1  $—  $8  1  $—  
Municipal obligations$—  1  $—  $—  —  $—  
Corporate debt obligations$—  —  $—  $23  7  $(1) 
Other mortgage-backed securities$—  —  $—  $—  1  $—  
Held-to-maturity securities
Agency - Residential$—  —  $—  $9  2  $—  
December 31, 2019
Available-for-sale securities
Agency - Commercial$148  17  $(3) $303  19  $—  
Agency - Residential$266  26  $(3) $148  14  $(1) 
Municipal obligations$8  3  $—  $—  —  $—  
Held-to-maturity securities
Agency - Commercial $148  13  $(1) $85  6  $—  
Agency - Residential$35  7  $(1) $38  10  $—  
Summary of Unrealized Loss Positions on Investment Securities - Available-for-Sale
The following table summarizes the unrealized loss positions on available-for-sale and held-to-maturity investment securities, by duration of the unrealized loss: 
 Unrealized Loss Position with
Duration 12 Months and Over		Unrealized Loss Position with
Duration Under 12 Months
Fair ValueNumber of SecuritiesUnrealized LossFair
Value		Number of
Securities		Unrealized
Loss
(Dollars in millions)
June 30, 2020
Available-for-sale securities
Agency - Commercial$4  1  $—  $8  1  $—  
Municipal obligations$—  1  $—  $—  —  $—  
Corporate debt obligations$—  —  $—  $23  7  $(1) 
Other mortgage-backed securities$—  —  $—  $—  1  $—  
Held-to-maturity securities
Agency - Residential$—  —  $—  $9  2  $—  
December 31, 2019
Available-for-sale securities
Agency - Commercial$148  17  $(3) $303  19  $—  
Agency - Residential$266  26  $(3) $148  14  $(1) 
Municipal obligations$8  3  $—  $—  —  $—  
Held-to-maturity securities
Agency - Commercial $148  13  $(1) $85  6  $—  
Agency - Residential$35  7  $(1) $38  10  $—  
Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity The following table shows the amortized cost and estimated fair value of securities by contractual maturity:
 Investment Securities Available-for-SaleInvestment Securities Held-to-maturity
Amortized
Cost		Fair
Value		Weighted Average
Yield 		Amortized
Cost		Fair
Value		Weighted Average
Yield
(Dollars in millions)
June 30, 2020
Due in one year or less$4  $4  2.07 %$—  $—  — %
Due after one year through five years10  10  2.73 %8  9  2.51 %
Due after five years through 10 years110  112  4.19 %8  8  2.30 %
Due after 10 years2,144  2,222  2.38 %480  499  2.38 %
Total$2,268  $2,348  $496  $516