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INVESTMENT SECURITIES (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2024 and December 31, 2023, respectively:
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 (in millions)
March 31, 2024
U.S. Treasury and other U.S. government
    corporations and agencies:
U.S. Treasury and agency obligations$2,928 $— $(84)$2,844 
Mortgage-backed securities3,925 — (486)3,439 
Tax-exempt municipal securities850 — (24)826 
Mortgage-backed securities:
Residential462 — (68)394 
Commercial1,420 1 (113)1,308 
Asset-backed securities1,552 2 (37)1,517 
Corporate debt securities7,348 24 (623)6,749 
Total debt securities$18,485 $27 $(1,435)17,077 
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 March 31, 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)
March 31, 2024
U.S. Treasury and other U.S. government corporations and agencies:
U.S. Treasury and agency obligations$2,301 $(43)$447 $(41)$2,748 $(84)
Mortgage-backed securities862 (15)2,513 (471)3,375 (486)
Tax-exempt municipal securities261 (1)508 (23)769 (24)
Mortgage-backed securities:
Residential9 — 365 (68)374 (68)
Commercial— — 1,242 (113)1,242 (113)
Asset-backed securities447 (2)787 (35)1,234 (37)
Corporate debt securities824 (7)4,702 (616)5,526 (623)
Total debt securities$4,704 $(68)$10,564 $(1,367)$15,268 $(1,435)
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 months ended March 31, 2024 and 2023:
 Three Months Ended March 31,
 20242023
 (in millions)
Gross gains on investment securities$2 $— 
Gross losses on investment securities(1)(61)
Gross gains on equity securities— 1 
Gross losses on equity securities— — 
Net recognized gains (losses) on investment securities$1 $(60)
Schedule of Gain (Loss) on Equity Securities
The gains and losses related to equity securities for the three months ended March 31, 2024 and 2023 was as follows:
Three Months Ended March 31,
20242023
(in millions)
Net gains (losses) recognized on equity securities during the period$— $1 
Less: Net gains (losses) recognized on equity securities sold during the period— 1 
Unrealized gains (losses) recognized on equity securities still held at the end of the period$— $— 
Schedule of Contractual Maturity of Debt Securities Available for Sale
The contractual maturities of debt securities available for sale at March 31, 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$1,235 $1,229 
Due after one year through five years5,402 5,199 
Due after five years through ten years3,259 2,954 
Due after ten years1,230 1,037 
Mortgage and asset-backed securities7,359 6,658 
Total debt securities$18,485 $17,077