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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2022
Investments [Abstract]  
Schedule of Amortized Cost and Fair Value of Investment Securities
The following tables as of December 31, 2022 include the investment security balances acquired in the CIT Merger, which were recorded at fair value on the acquisition date. The amortized cost and fair value of investment securities at December 31, 2022 and 2021, were as follows:

Amortized Cost and Fair Value - Debt Securities
dollars in millions December 31, 2022
Amortized CostGross Unrealized
Gains		Gross Unrealized
Losses		Fair Value
Investment securities available for sale
U.S. Treasury$2,035 $— $(137)$1,898 
Government agency164 — (2)162 
Residential mortgage-backed securities5,424 1 (630)4,795 
Commercial mortgage-backed securities1,774 — (170)1,604 
Corporate bonds570 — (34)536 
Total investment securities available for sale$9,967 $1 $(973)$8,995 
Investment in marketable equity securities$75 $21 $(1)$95 
Investment securities held to maturity
U.S. Treasury$474 $— $(50)$424 
Government agency1,548 — (186)1,362 
Residential mortgage-backed securities4,605 — (723)3,882 
Commercial mortgage-backed securities3,355 — (484)2,871 
Supranational securities295 — (41)254 
Other2 — — 2 
Total investment securities held to maturity$10,279 $— $(1,484)$8,795 
Total investment securities$20,321 $22 $(2,458)$17,885 
December 31, 2021
Amortized CostGross Unrealized
Gains		Gross Unrealized
Losses		Fair Value
Investment securities available for sale
U.S. Treasury$2,007 $— $(2)$2,005 
Government agency221 1 (1)221 
Residential mortgage-backed securities4,757 8 (36)4,729 
Commercial mortgage-backed securities1,648 9 (17)1,640 
Corporate bonds582 27 (1)608 
Total investment securities available for sale$9,215 $45 $(57)$9,203 
Investment in marketable equity securities$73 $25 $— $98 
Investment securities held to maturity
Residential mortgage-backed securities$2,322 $6 $(22)$2,306 
Commercial mortgage-backed securities1,485 — (34)1,451 
Other2 — — 2 
Total investment securities held to maturity$3,809 $6 $(56)$3,759 
Total investment securities$13,097 $76 $(113)$13,060 
Schedule of Investment Securities Maturity Information
The following table provides the amortized cost and fair value by contractual maturity. Expected maturities will differ from contractual maturities on certain securities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Residential and commercial mortgage-backed and government agency securities are stated separately as they are not due at a single maturity date.

Maturities - Debt Securities
dollars in millionsDecember 31, 2022December 31, 2021
CostFair ValueCostFair Value
Investment securities available for sale
Non-amortizing securities maturing in:
One year or less$37 $37 $— $— 
After one through five years2,068 1,928 2,049 2,048 
After five through 10 years483 455 523 548 
After 10 years17 14 17 17 
Government agency164 162 221 221 
Residential mortgage-backed securities5,424 4,795 4,757 4,729 
Commercial mortgage-backed securities1,774 1,604 1,648 1,640 
Total investment securities available for sale$9,967 $8,995 $9,215 $9,203 
Investment securities held to maturity
Non-amortizing securities maturing in:
One year or less$51 $51 $2 $2 
After one through five years1,479 1,328 — — 
After five through 10 years789 663 — — 
Residential mortgage-backed securities4,605 3,882 2,322 2,306 
Commercial mortgage-backed securities3,355 2,871 1,485 1,451 
Total investment securities held to maturity$10,279 $8,795 $3,809 $3,759 
Schedule of Interest and Dividends on Investment Securities
The following table presents interest and dividend income on investment securities.

Interest and Dividends on Investment Securities
dollars in millionsYear ended December 31
202220212020
Interest income - taxable investment securities$352 $143 $140 
Dividend income - marketable equity securities2 2 4 
Interest on investment securities$354 $145 $144 
Schedule of Realized Gain (Loss)
The following table provides the gross realized gains and losses on the sales of investment securities available for sale:

Realized Gains on Debt Securities Available For Sale
dollars in millionsYear ended December 31
202220212020
Gross realized gains on sales of investment securities available for sale$— $33 $61 
Gross realized losses on sales of investment securities available for sale— — (1)
Net realized gains on sales of investment securities available for sale$— $33 $60 

The following table provides the fair value adjustment on marketable equity securities:

Fair Value Adjustment on Marketable Equity Securities
dollars in millionsYear ended December 31
202220212020
Fair value adjustment on marketable equity securities, net$(3)$34 $29 
Schedule of Unrealized Loss on Available-for-sale Securities
The following table provides information regarding investment securities available for sale with unrealized losses for which an ACL has not been recorded:

Gross Unrealized Losses on Debt Securities Available For Sale
dollars in millionsDecember 31, 2022
Less than 12 months12 months or moreTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Investment securities available for sale
U.S. Treasury$403 $(27)$1,495 $(110)$1,898 $(137)
Government agency65 (1)62 (1)127 (2)
Residential mortgage-backed securities1,698 (165)3,001 (465)4,699 (630)
Commercial mortgage-backed securities836 (53)752 (117)1,588 (170)
Corporate bonds499 (30)37 (4)536 (34)
Total$3,501 $(276)$5,347 $(697)$8,848 $(973)
December 31, 2021
Less than 12 months12 months or moreTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
Investment securities available for sale
U.S. Treasury$1,811 $(2)$— $— $1,811 $(2)
Government agency17 — 79 (1)96 (1)
Residential mortgage-backed securities3,992 (36)1 — 3,993 (36)
Commercial mortgage-backed securities852 (15)111 (2)963 (17)
Corporate bonds52 (1)— — 52 (1)
Total$6,724 $(54)$191 $(3)$6,915 $(57)