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Investment Securities - (Tables)
 12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Investment Securities Summary The following table summarizes our available for sale and held to maturity portfolios by major security type:
Table 41: Investment Securities Summary
December 31, 2020 (a)December 31, 2019
In millionsAmortized
Cost (b)		UnrealizedFair
Value		Amortized
Cost		UnrealizedFair
Value
GainsLossesGainsLosses
Securities Available for Sale
U.S. Treasury and government agencies$19,821 $903 $(13)$20,711 $16,150 $382 $(16)$16,516 
Residential mortgage-backed
Agency47,355 1,566 (10)48,911 35,847 517 (43)36,321 
Non-agency1,272 243 (14)1,501 1,515 302 (3)1,814 
Commercial mortgage-backed
Agency2,571 119 (2)2,688 3,094 42 (18)3,118 
Non-agency3,678 78 (67)3,689 3,352 29 (9)3,372 
Asset-backed5,060 100 (10)5,150 5,044 78 (8)5,114 
Other4,415 293 4,708 2,788 121 (1)2,908 
Total securities available for sale (b)$84,172 $3,302 $(116)$87,358 $67,790 $1,471 $(98)$69,163 
Securities Held to Maturity
U.S. Treasury and government agencies$795 $125 $920 $776 $56 $832 
Residential mortgage-backed
Agency14,419 270 $(26)14,663 
Non-agency133 7 140 
Commercial mortgage-backed
Agency59 1 60 
Non-agency430 4 434 
Asset-backed52 52 
Other646 42 $(3)685 1,792 85 (14)1,863 
Total securities held to maturity (b) (c)$1,441 $167 $(3)$1,605 $17,661 $423 $(40)$18,044 
(a) The accrued interest associated with our available for sale and held to maturity portfolios totaled $238 million and $5 million at December 31, 2020, respectively. These amounts are included in Other assets on the Consolidated Balance Sheet.
(b) Amortized cost is presented net of allowance of $79 million for securities available for sale and $3 million for securities held to maturity at December 31, 2020 in accordance with the CECL accounting standard. See the Recently Adopted Accounting Standards portion of Note 1 Accounting Policies for additional detail on the CECL accounting standard.
(c) Credit ratings represent a primary credit quality indicator used to monitor and manage credit risk. As of December 31, 2020, 85% of our securities held to maturity were rated AAA/AA.
Gross Unrealized Loss and Fair Value of Securities Available for Sale Without an Allowance for Credit Losses
Table 42: Gross Unrealized Loss and Fair Value of Securities Available for Sale Without an Allowance for Credit Losses
Unrealized loss position
less than 12 months		Unrealized loss position
12 months or more		Total
In millionsUnrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value
December 31, 2020
U.S. Treasury and government agencies$(13)$603 $(13)$603 
Residential mortgage-backed
Agency(8)3,152 $(2)$82 (10)3,234 
Non-agency(7)119 (7)73 (14)192 
Commercial mortgage-backed
Agency(2)149 (2)149 
Non-agency(13)972 (7)714 (20)1,686 
Asset-backed(1)339 (9)706 (10)1,045 
Total securities available for sale$(42)$5,185 $(27)$1,724 $(69)$6,909 
Gross Unrealized Loss and Fair Value of Debt Securities
Table 43: Gross Unrealized Loss and Fair Value of Debt Securities
 Unrealized loss position less than 12 monthsUnrealized loss position 12 months or moreTotal
In millionsUnrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value		Unrealized
Loss		Fair
Value
December 31, 2019
Securities Available for Sale
U.S. Treasury and government agencies$(14)$2,451 $(2)$607 $(16)$3,058 
Residential mortgage-backed
Agency(6)2,832 (37)4,659 (43)7,491 
Non-agency(3)102 (3)102 
Commercial mortgage-backed
Agency(6)852 (12)953 (18)1,805 
Non-agency(4)1,106 (5)230 (9)1,336 
Asset-backed(3)660 (5)561 (8)1,221 
Other(1)403 (1)403 
Total securities available for sale$(33)$7,901 $(65)$7,515 $(98)$15,416 
Securities Held to Maturity
Residential mortgage-backed - Agency$(26)$2,960 $(26)$2,960 
Other$(1)$22 (13)105 (14)127 
Total securities held to maturity$(1)$22 $(39)$3,065 $(40)$3,087 
Gains (losses) on Sales Of Securities Available for Sale
Information relating to gross realized securities gains and losses from the sales of securities is set forth in the following table:

Table 44: Gains (Losses) on Sales of Securities Available for Sale
Year ended December 31
In millions		Gross GainsGross LossesNet GainsTax Expense
2020$307 $(2)$305 $64 
2019$69 $(21)$48 $10 
2018$57 $(57)
Contractual Maturity of Securities
The following table presents, by remaining contractual maturity, the amortized cost, fair value and weighted-average yield of debt securities at December 31, 2020:
Table 45: Contractual Maturity of Debt Securities
December 31, 20201 Year or
Less		After 1 Year
through 5 Years		After 5 Years
through 10 Years		After 10
Years		Total
Dollars in millions
Securities Available for Sale
U.S. Treasury and government agencies$1,149 $11,973 $5,418 $1,281 $19,821 
Residential mortgage-backed
Agency1 205 2,384 44,765 47,355 
Non-agency1,272 1,272 
Commercial mortgage-backed
Agency13 563 679 1,316 2,571 
Non-agency83 236 3,359 3,678 
Asset-backed67 2,375 1,029 1,589 5,060 
Other788 1,502 1,218 907 4,415 
Total securities available for sale at amortized cost$2,018 $16,701 $10,964 $54,489 $84,172 
Fair value$2,038 $17,283 $11,443 $56,594 $87,358 
Weighted-average yield, GAAP basis (a)2.20 %1.81 %1.74 %2.80 %2.45 %
Securities Held to Maturity
U.S. Treasury and government agencies$199 $312 $284 $795 
Other$34 422 109 81 646 
Total securities held to maturity at amortized cost$34 $621 $421 $365 $1,441 
Fair value$35 $659 $507 $404 $1,605 
Weighted-average yield, GAAP basis (a)3.75 %3.26 %3.93 %2.48 %3.29 %
(a) Weighted-average yields are based on amortized cost with effective yields weighted for the contractual maturity of each security. Actual maturities and yields may differ as certain securities may be prepaid.
Fair Value of Securities Pledged and Accepted as Collateral The following table presents the fair value of securities that have been either pledged to or accepted from others to collateralize outstanding borrowings:
Table 46: Fair Value of Securities Pledged and Accepted as Collateral
In millionsDecember 31
2020		December 31
2019
Pledged to others$22,841 $14,609 
Accepted from others:
Permitted by contract or custom to sell or repledge (a)$683 $2,349 
Permitted amount repledged to others$683 $360 
(a)Balances at December 31, 2019 include $2.0 billion in fair value of securities accepted from others to collateralize short-term investments in resale agreements that were not repledged.