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SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Value of Securities Available for Sale
The amortized cost and fair value of AFS debt securities for the current period are as follows. There was no ACL in the AFS portfolio during the nine months ended September 30, 2020. Accrued interest receivable on AFS debt securities totaled $5.8 million at September 30, 2020 and is excluded from the estimate of credit losses and recorded separately in other assets in the Consolidated Balance Sheets. Accordingly, we have excluded accrued interest receivable from both the fair value and the amortized cost basis of AFS debt securities.
TABLE 3.1
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
 Value
Debt Securities AFS:
September 30, 2020
U.S. Treasury$300 $— $— $300 
U.S. government agencies161 — (1)160 
U.S. government-sponsored entities135 2 — 137 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,057 39 — 1,096 
Agency collateralized mortgage obligations941 35 — 976 
Commercial mortgage-backed securities396 20 — 416 
States of the U.S. and political subdivisions (municipals)14 — — 14 
Other debt securities2 — — 2 
Total debt securities AFS$3,006 $96 $(1)$3,101 
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
The amortized cost and fair value of HTM debt securities for the current period are presented in the table below. The ACL for the HTM municipal bond portfolio was $0.05 million at September 30, 2020. Accrued interest receivable on HTM debt securities totaled $12.2 million at September 30, 2020 and is excluded from the estimate of credit losses and recorded separately in other assets in the Consolidated Balance Sheets.
TABLE 3.3
(in millions)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
 Value
Debt Securities HTM:
September 30, 2020
U.S. Treasury$1 $— $— $1 
U.S. government agencies1 — — 1 
U.S. government-sponsored entities160 1 — 161 
Residential mortgage-backed securities:
Agency mortgage-backed securities811 32 — 843 
Agency collateralized mortgage obligations571 19 — 590 
Commercial mortgage-backed securities278 12 — 290 
States of the U.S. and political subdivisions (municipals)1,144 42 — 1,186 
Total debt securities HTM$2,966 $106 $— $3,072 
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 September 30, 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$343 $343 $142 $143 
Due after one year but within five years107 108 41 41 
Due after five years but within ten years69 69 144 148 
Due after ten years93 93 979 1,017 
612 613 1,306 1,349 
Residential mortgage-backed securities:
Agency mortgage-backed securities1,057 1,096 811 843 
Agency collateralized mortgage obligations941 976 571 590 
Commercial mortgage-backed securities396 416 278 290 
Total debt securities$3,006 $3,101 $2,966 $3,072 
Schedule of Securities Pledged as Collateral
Following is information relating to securities pledged:
TABLE 3.6
(dollars in millions)September 30,
2020		December 31,
2019
Securities pledged (carrying value):
To secure public deposits, trust deposits and for other purposes as required by law$5,427 $4,494 
As collateral for short-term borrowings390 285 
Securities pledged as a percent of total securities95.9 %72.8 %
Summaries of Fair Values and Unrealized Losses of Impaired 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 surety 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
September 30, 2020
U.S. Treasury1 $100 $— — $— $— 1 $100 $— 
U.S. government agencies1 13 — 17 74 (1)18 87 (1)
Residential mortgage-backed securities:
Agency collateralized mortgage obligations2 5 — — — — 2 5 — 
Other debt securities— — — 1 2 — 1 2 — 
Total 4 $118 $— 18 $76 $(1)22 $194 $(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)
Commercial mortgage-backed securities3 114 (2)— — — 3 114 (2)
Other debt securities— — — 1 2 — 1 2 — 
Total temporarily impaired debt securities AFS32 $685 $(4)78 $712 $(6)110 $1,397 $(10)