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Securities (Tables)
 12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Value of Securities Available for Sale
TABLE 3.1
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Debt Securities AFS:
December 31, 2020
U.S. Treasury$600 $— $— $600 
U.S. government agencies172 — — 172 
U.S. government-sponsored entities160 1 — 161 
Residential mortgage-backed securities:
Agency mortgage-backed securities959 35 — 994 
Agency collateralized mortgage obligations1,094 31 (1)1,124 
Commercial mortgage-backed securities361 17 — 378 
States of the U.S. and political subdivisions (municipals)32 — — 32 
Other debt securities2 — — 2 
Total debt securities AFS$3,380 $84 $(1)$3,463 
The amortized cost and fair value of debt securities AFS for December 31, 2019 are as follows:
TABLE 3.2
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
 Value
Debt Securities AFS:
December 31, 2019
U.S. government agencies$152 $— $(1)$151 
U.S. government-sponsored entities225 1 — 226 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,310 7 (3)1,314 
Agency collateralized mortgage obligations1,234 10 (4)1,240 
Commercial mortgage-backed securities341 6 (2)345 
States of the U.S. and political subdivisions (municipals)11 — — 11 
Other debt securities2 — — 2 
Total debt securities AFS$3,275 $24 $(10)$3,289 
Schedule of Amortized Cost and Fair Value of Securities Held to Maturity
TABLE 3.3
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
 Value
Debt Securities HTM:
December 31, 2020
U.S. Treasury$1 $— $— $1 
U.S. government agencies1 — — 1 
U.S. government-sponsored entities120 1 — 121 
Residential mortgage-backed securities:
Agency mortgage-backed securities769 29 — 798 
Agency collateralized mortgage obligations562 17 — 579 
Commercial mortgage-backed securities307 10 — 317 
States of the U.S. and political subdivisions (municipals)1,108 48 — 1,156 
Total debt securities HTM$2,868 $105 $— $2,973 
The amortized cost and fair value of HTM debt securities for December 31, 2019 are as follows:
TABLE 3.4
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
 Value
Debt Securities HTM:
December 31, 2019
U.S. Treasury$1 $— $— $1 
U.S. government agencies1 — — 1 
U.S. government-sponsored entities175 — — 175 
Residential mortgage-backed securities:
Agency mortgage-backed securities949 8 (2)955 
Agency collateralized mortgage obligations721 5 (6)720 
Commercial mortgage-backed securities308 3 (2)309 
States of the U.S. and political subdivisions (municipals)1,120 26 (2)1,144 
Total debt securities HTM$3,275 $42 $(12)$3,305 
Amortized Cost and Fair Value of Securities, by Contractual Maturities
As of December 31, 2020, the amortized cost and fair value of debt securities, by contractual maturities, were as follows:
TABLE 3.5
Available for SaleHeld to Maturity
(in millions)Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in one year or less$642 $642 $122 $123 
Due after one year but within five years113 114 20 20 
Due after five years but within ten years124 125 151 155 
Due after ten years87 86 937 981 
966 967 1,230 1,279 
Residential mortgage-backed securities:
Agency mortgage-backed securities959 994 769 798 
Agency collateralized mortgage obligations1,094 1,124 562 579 
Commercial mortgage-backed securities361 378 307 317 
Total debt securities$3,380 $3,463 $2,868 $2,973 
Schedule of Securities Pledged as Collateral
Following is information relating to securities pledged:
TABLE 3.6
December 3120202019
(dollars in millions)
Securities pledged (carrying value):
To secure public deposits, trust deposits and for other purposes as required by law$5,384 $4,494 
As collateral for short-term borrowings402 285 
Securities pledged as a percent of total securities91.4 %72.8 %
Summaries of Fair Values and Unrealized Losses of Securities, Segregated by Length of Impairment
Following are summaries of the fair values of AFS debt securities in an unrealized loss position for which an ACL has not been recorded, segregated by security type and length of continuous loss position:
TABLE 3.7
Less than 12 Months12 Months or MoreTotal
(dollars in millions)#Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses
Debt Securities AFS
December 31, 2020
U.S. government agencies1 $13 $— 16 $69 $— 17 $82 $— 
U.S. government-sponsored entities1 25 — — — — 1 25 — 
Residential mortgage-backed securities:
Agency collateralized mortgage obligations5 130 (1)— — — 5 130 (1)
Other debt securities— — — 1 2 — 1 2 — 
Total 7 $168 $(1)17 $71 $— 24 $239 $(1)
Less than 12 Months12 Months or MoreTotal
(dollars in millions)#Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses		#Fair
Value		Unrealized
Losses
Debt Securities AFS
December 31, 2019
U.S. government agencies5 $48 $— 15 $61 $(1)20 $109 $(1)
U.S. government-sponsored entities— — — 6 130 — 6 130 — 
Residential mortgage-backed securities:
Agency mortgage-backed securities13 200 (1)24 314 (2)37 514 (3)
Agency collateralized mortgage obligations11 323 (1)32 205 (3)43 528 (4)
Non-agency collateralized mortgage obligations— — — — — — — — — 
Commercial mortgage-backed securities3 114 (2)— — — 3 114 (2)
States of the U.S. and political subdivisions (municipals)— — — — — — — — — 
Other debt securities— — — 1 2 — 1 2 — 
Total temporarily impaired debt securities AFS32 $685 $(4)78 $712 $(6)110 $1,397 $(10)