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INVESTMENT SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2024
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 June 30, 2024 and December 31, 2023, respectively:
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 (in millions)
June 30, 2024
U.S. Treasury and other U.S. government
    corporations and agencies:
U.S. Treasury and agency obligations$3,080 $1 $(92)$2,989 
Mortgage-backed securities4,264 4 (509)3,759 
Tax-exempt municipal securities770 — (27)743 
Mortgage-backed securities:
Residential451 — (70)381 
Commercial1,374 — (112)1,262 
Asset-backed securities1,531 2 (35)1,498 
Corporate debt securities7,797 23 (640)7,180 
Total debt securities$19,267 $30 $(1,485)$17,812 
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 
Schedule of Gross Unrealized Losses and Fair Value of Securities
Gross unrealized losses and fair values aggregated by investment category and length of time of individual debt securities that have been in a continuous unrealized loss position for which no allowances for credit loss has been recorded were as follows at June 30, 2024 and December 31, 2023, 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)
June 30, 2024
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations$1,592 $(32)$1,135 $(60)$2,727 $(92)
Mortgage-backed securities734 (14)2,732 (495)3,466 (509)
Tax-exempt municipal securities208 (2)503 (25)711 (27)
Mortgage-backed securities:
Residential21 (1)353 (69)374 (70)
Commercial54 (1)1,179 (111)1,233 (112)
Asset-backed securities398 (2)735 (33)1,133 (35)
Corporate debt securities1,333 (14)4,570 (626)5,903 (640)
Total debt securities$4,340 $(66)$11,207 $(1,419)$15,547 $(1,485)
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 $(1,328)
Schedule of Realized Gains (Losses) Related to Investment Securities Included Within Investment Income
The detail of gains (losses) related to investment securities and included within investment income was as follows for the three and six months ended June 30, 2024 and 2023:
 Three months ended June 30,Six Months Ended June 30,
 2024202320242023
 (in millions)(in millions)
Gross gains on investment securities$— $15 $2 $15 
Gross losses on investment securities(1)— (2)(61)
Gross gains on equity securities— — — 1 
Gross losses on equity securities— — — — 
Net recognized (losses) gains on investment securities$(1)$15 $— $(45)
Schedule of Gain (Loss) on Equity Securities
The gains and losses related to equity securities for the three and six months ended June 30, 2024 and 2023 was as follows:
Three months ended June 30,Six Months Ended June 30,
2024202320242023
(in millions)(in millions)
Net gains recognized on equity securities during the period$— $— $— $1 
Less: Net gains recognized on equity securities sold during the period— — — 1 
Unrealized gains (losses) recognized on equity securities still held at the end of the period$— $— $— $— 
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at June 30, 2024, 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$1,390 $1,381 
Due after one year through five years5,291 5,085 
Due after five years through ten years3,791 3,476 
Due after ten years1,175 970 
Mortgage and asset-backed securities7,620 6,900 
Total debt securities$19,267 $17,812