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Securities (Tables)
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Fair Value of the Securities Available-for-Sale and Held-to-Maturity
Our securities available-for-sale and securities held-to-maturity portfolios consisted of the following:
September 30, 2021Amortized
Cost		Allowance for Credit LossesUnrealized
Gains		Unrealized
Losses		Fair
Value
 (in millions)
Securities available-for-sale:
U.S. Treasury$12,510 $— $216 $(90)$12,636 
U.S. Government sponsored enterprises:
Mortgage-backed securities7,735 — 154 (94)7,795 
Collateralized mortgage obligations1,831 — 9 (37)1,803 
Direct agency obligations1,449 — 19 — 1,468 
U.S. Government agency issued or guaranteed:
Mortgage-backed securities7,172 — 30 (41)7,161 
Collateralized mortgage obligations2,989 — 11 (24)2,976 
Direct agency obligations280 — 7 — 287 
Asset-backed securities collateralized by:
Home equity21 (1)— — 20 
Other108 — — (7)101 
Foreign debt securities(1)
2,257 — 3 — 2,260 
Total available-for-sale securities$36,352 $(1)$449 $(293)$36,507 
Securities held-to-maturity:
U.S. Government sponsored enterprises:
Mortgage-backed securities$735 $— $30 $— $765 
Collateralized mortgage obligations550 — 35 — 585 
U.S. Government agency issued or guaranteed:
Mortgage-backed securities1,250 — 39 — 1,289 
Collateralized mortgage obligations3,322 — 126 — 3,448 
Obligations of U.S. states and political subdivisions9 — — — 9 
Asset-backed securities collateralized by residential mortgages1 (1)1 — 1 
Total held-to-maturity securities$5,867 $(1)$231 $— $6,097 
December 31, 2020Amortized
Cost		Allowance for Credit LossesUnrealized
Gains		Unrealized
Losses		Fair
Value
 (in millions)
Securities available-for-sale:
U.S. Treasury$16,087 $— $608 $(47)$16,648 
U.S. Government sponsored enterprises:
Mortgage-backed securities5,986 — 280 (2)6,264 
Collateralized mortgage obligations1,676 — 19 (2)1,693 
Direct agency obligations1,236 — 17 — 1,253 
U.S. Government agency issued or guaranteed:
Mortgage-backed securities6,993 — 152 — 7,145 
Collateralized mortgage obligations2,093 — 22 (11)2,104 
Direct agency obligations296 — 5 — 301 
Asset-backed securities collateralized by:
Home equity28 (1)— — 27 
Other114 — — (10)104 
Foreign debt securities(1)
5,127 — 6 — 5,133 
Total available-for-sale securities$39,636 $(1)$1,109 $(72)$40,672 
Securities held-to-maturity:
U.S. Government sponsored enterprises:
Mortgage-backed securities$1,137 $— $44 $— $1,181 
Collateralized mortgage obligations780 — 53 — 833 
U.S. Government agency issued or guaranteed:
Mortgage-backed securities1,947 — 76 — 2,023 
Collateralized mortgage obligations5,107 — 212 — 5,319 
Obligations of U.S. states and political subdivisions10 — 1 — 11 
Asset-backed securities collateralized by residential mortgages2 (2)2 — 2 
Total held-to-maturity securities$8,983 $(2)$388 $— $9,369 
(1)Foreign debt securities represent public sector entity, bank or corporate debt.
Gross Unrealized Losses and Related Fair Value The following table summarizes gross unrealized losses and related fair values for securities available-for-sale by major security type at September 30, 2021 and December 31, 2020 classified as to the length of time the losses have existed:
 One Year or LessGreater Than One Year
Number
of
Securities		Gross
Unrealized
Losses		Aggregate
Fair Value
of Investment		Number
of
Securities		Gross
Unrealized
Losses		Aggregate
Fair Value
of Investment
 (dollars are in millions)
At September 30, 2021
U.S. Treasury17 $(48)$2,416 9 $(42)$752 
U.S. Government sponsored enterprises60 (127)5,879 11 (4)185 
U.S. Government agency issued or guaranteed38 (56)7,274 11 (9)495 
Asset-backed securities— — — 5 (7)101 
Foreign debt securities5 — 508 1 — 25 
Securities available-for-sale120 $(231)$16,077 37 $(62)$1,558 
At December 31, 2020
U.S. Treasury5 $(5)$751 13 $(42)$1,271 
U.S. Government sponsored enterprises15 (3)715 8 (1)46 
U.S. Government agency issued or guaranteed13 (11)1,482 3 — 8 
Asset-backed securities3 (10)104 2 — — 
Foreign debt securities6 — 766 5 — 241 
Securities available-for-sale42 $(29)$3,818 31 $(43)$1,566 
Realized Gains and Losses on Investment Securities Transactions Attributable to Available-for-Sale Securities The following table summarizes realized gains and losses on investment securities transactions attributable to available-for-sale securities:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
 (in millions)
Gross realized gains$21 $53 $109 $140 
Gross realized losses(17)(1)(58)(29)
Net realized gains$4 $52 $51 $111 
Distribution of Maturities of Debt Securities with the Approximate Yield of the Portfolio The table below also reflects the distribution of maturities of debt securities held at September 30, 2021, together with the approximate yield of the portfolio. The yields shown are calculated by dividing annualized interest income, including the accretion of discounts and the amortization of premiums, by the amortized cost of securities outstanding at September 30, 2021.
 Within
One Year		After One
But Within
Five Years		After Five
But Within
Ten Years		After Ten
Years
AmountYieldAmountYieldAmountYieldAmountYield
 (dollars are in millions)
Available-for-sale:
U.S. Treasury$772 4.07 %$3,910 .95 %$3,666 1.36 %$4,162 1.93 %
U.S. Government sponsored enterprises
31 2.75 1,316 1.78 2,194 2.35 7,474 1.64 
U.S. Government agency issued or guaranteed
71 .24 23 1.25 1 6.13 10,346 1.75 
Asset-backed securities— — — — 58 5.13 71 3.52 
Foreign debt securities1,104 .43 1,153 .57 — — — — 
Total amortized cost$1,978 1.88 %$6,402 1.05 %$5,919 1.77 %$22,053 1.75 %
Total fair value$1,981 $6,513 $6,052 $21,961 
Held-to-maturity:
U.S. Government sponsored enterprises
$— — %$184 2.65 %$327 2.26 %$774 3.30 %
U.S. Government agency issued or guaranteed
3 3.83 — — 8 5.14 4,561 2.56 
Obligations of U.S. states and political subdivisions
3 3.43 4 3.00 2 4.25 — — 
Asset-backed securities— — — — — — 1 7.53 
Total amortized cost$6 3.78 %$188 2.66 %$337 2.34 %$5,336 2.67 %
Total fair value$6 $192 $350 $5,549 
Equity Securities Not Classified as Trading Equity securities that are not classified as trading and are included in other assets consisted of the following:
September 30, 2021December 31, 2020
 (in millions)
Equity securities carried at fair value$289 $284 
Equity securities without readily determinable fair values16 14