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INVESTMENT SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investment Securities Classified as Current and Long-Term
Investment securities classified as current and long-term were as follows at December 31, 2023 and 2022, respectively:
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 (in millions)
December 31, 2023
U.S. Treasury and other U.S. government
    corporations and agencies:
U.S. Treasury and agency obligations$2,717 $1 $(51)$2,667 
Mortgage-backed securities3,946 1 (425)3,522 
Tax-exempt municipal securities879 1 (22)858 
Mortgage-backed securities:
Residential465 1 (66)400 
Commercial1,471 — (126)1,345 
Asset-backed securities1,813 2 (44)1,771 
Corporate debt securities7,011 28 (594)6,445 
Total debt securities$18,302 $34 $(1,328)17,008 
Common stock— 
Total investment securities$17,008 
December 31, 2022
U.S. Treasury and other U.S. government
    corporations and agencies:
U.S. Treasury and agency obligations$1,093 $1 $(55)$1,039 
Mortgage-backed securities3,697 4 (471)3,230 
Tax-exempt municipal securities765 — (37)728 
Mortgage-backed securities:
Residential477 — (76)401 
Commercial1,554 — (155)1,399 
Asset-backed securities1,809 1 (79)1,731 
Corporate debt securities6,551 3 (828)5,726 
Total debt securities$15,946 $9 $(1,701)14,254 
Common stock7 
Total investment securities$14,261 
Schedule of Gross Unrealized Losses and Fair Value of Securities
Gross unrealized losses and fair values aggregated by investment category and length of time that individual debt securities have been in a continuous unrealized loss position were as follows at December 31, 2023 and 2022, respectively:
 Less than 12 months12 months or moreTotal
 Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
 (in millions)
December 31, 2023
U.S. Treasury and other U.S. government
    corporations and agencies:
U.S. Treasury and agency obligations$1,899 $(12)$431 $(39)$2,330 $(51)
Mortgage-backed securities958 (12)2,269 (413)3,227 (425)
Tax-exempt municipal securities160 (1)523 (21)683 (22)
Mortgage-backed securities:
Residential— — 373 (66)373 (66)
Commercial18 — 1,303 (126)1,321 (126)
Asset-backed securities120 (1)1,364 (43)1,484 (44)
Corporate debt securities466 (2)4,783 (592)5,249 (594)
Total debt securities$3,621 $(28)$11,046 $(1,300)$14,667 $(1,328)
December 31, 2022
U.S. Treasury and other U.S. government
    corporations and agencies:
U.S. Treasury and agency obligations$512 $(5)$397 $(50)$909 $(55)
Mortgage-backed securities1,231 (104)1,683 (367)2,914 (471)
Tax-exempt municipal securities64 (2)615 (36)679 (38)
Mortgage-backed securities:
Residential124 (16)274 (60)398 (76)
Commercial243 (13)1,157 (142)1,400 (155)
Asset-backed securities620 (32)1,011 (46)1,631 (78)
Corporate debt securities1,625 (98)3,825 (730)5,450 (828)
Total debt securities$4,419 $(270)$8,962 $(1,431)$13,381 $(1,701)
Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income
The detail of realized gains (losses) related to investment securities and included within investment income was as follows for the years ended December 31, 2023, 2022, and 2021:
202320222021
(in millions)
Gross gains on investment securities$46 $62 $219 
Gross losses on investment securities(101)(144)(8)
Gross gains on equity securities1 51 23 
Gross losses on equity securities— (174)(364)
Net recognized losses on investment securities$(54)$(205)$(130)
Schedule of Gain (Loss) on Equity Securities
The gains and losses related to equity securities for the years ended December 31, 2023, 2022 and 2021 was as follows:
202320222021
(in millions)
Net gains (losses) recognized on equity securities during the period$1 $(123)$(341)
Less: Net gains (losses) recognized on equity securities sold during the period1 (105)(13)
Unrealized losses recognized on equity securities still held at the end of the period$— $(18)$(328)
Schedule of Contractual Maturities of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at December 31, 2023, regardless of their balance sheet classification, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
Amortized
Cost		Fair
Value
 (in millions)
Due within one year$1,243 $1,239 
Due after one year through five years5,279 5,112 
Due after five years through ten years2,936 2,657 
Due after ten years1,149 962 
Mortgage and asset-backed securities7,695 7,038 
Total debt securities$18,302 $17,008