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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of the cost/amortized cost, unrealized gains and losses, and fair value of available-for-sale securities by type
Cost/amortized cost, allowance for credit losses, unrealized gains and losses, and fair value of fixed maturity available-for-sale securities by type were as follows:
(dollars in millions)Cost/
Amortized
Cost		Unrealized
Gains		Unrealized
Losses		Fair
Value
December 31, 2022*    
Fixed maturity available-for-sale securities:    
U.S. government and government sponsored entities$17 $— $(1)$16 
Obligations of states, municipalities, and political subdivisions
74 — (8)66 
Commercial paper
55 — — 55 
Non-U.S. government and government sponsored entities
150 — (8)142 
Corporate debt
1,251 1 (115)1,137 
Mortgage-backed, asset-backed, and collateralized:
   
RMBS
217 — (25)192 
CMBS
38 — (3)35 
CDO/ABS
95 — (9)86 
Total$1,897 $1 $(169)$1,729 
December 31, 2021*
Fixed maturity available-for-sale securities:
U.S. government and government sponsored entities
$16 $— $— $16 
 Obligations of states, municipalities, and political subdivisions
76 3 — 79 
Commercial paper50 — — 50 
Non-U.S. government and government sponsored entities151 4 — 155 
Corporate debt1,246 61 (5)1,302 
Mortgage-backed, asset-backed, and collateralized:
RMBS169 3 (2)170 
CMBS44 1 — 45 
CDO/ABS90 1 (1)90 
Total$1,842 $73 $(8)$1,907 
*    The allowance for credit losses related to our investment securities as of December 31, 2022 and December 31, 2021 were immaterial.
Schedule of fair value and unrealized losses on investment securities by type and length of time in a continuous unrealized loss position
Fair value and unrealized losses on available-for-sale securities by type and length of time in a continuous unrealized loss position without an allowance for credit losses were as follows:
 Less Than 12 Months12 Months or LongerTotal
(dollars in millions)Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses
December 31, 2022      
U.S. government and government sponsored entities
$10 $— $6 $(1)$16 $(1)
Obligations of states, municipalities, and political subdivisions
48 (5)15 (3)63 (8)
Commercial paper
51 — — — 51 — 
Non-U.S. government and government sponsored entities
104 (3)32 (5)136 (8)
Corporate debt779 (54)299 (61)1,078 (115)
Mortgage-backed, asset-backed, and collateralized:
RMBS106 (9)68 (16)174 (25)
CMBS21 (2)13 (1)34 (3)
CDO/ABS45 (3)35 (6)80 (9)
Total$1,164 $(76)$468 $(93)$1,632 $(169)
December 31, 2021
      
U.S. government and government sponsored entities
$6 $— $— $— $6 $— 
Obligations of states, municipalities, and political subdivisions
10 — — — 10 — 
Commercial paper
46 — — — 46 — 
Non-U.S. government and government sponsored entities
19 — 5 — 24 — 
Corporate debt208 (3)38 (2)246 (5)
Mortgage-backed, asset-backed, and collateralized:
RMBS81 (1)15 (1)96 (2)
CMBS7 — — — 7 — 
CDO/ABS41 (1)3 — 44 (1)
Total$418 $(5)$61 $(3)$479 $(8)
Schedule of contractual maturities of fixed-maturity available-for-sale securities Contractual maturities of fixed-maturity available-for-sale securities at December 31, 2022 were as follows:
(dollars in millions)Fair
Value		Amortized
Cost
Fixed maturities, excluding mortgage-backed, asset-backed, and collateralized securities:
  
Due in 1 year or less$200 $201 
Due after 1 year through 5 years518 548 
Due after 5 years through 10 years541 614 
Due after 10 years157 184 
Mortgage-backed, asset-backed, and collateralized securities313 350 
Total$1,729 $1,897 
Schedule of fair value of other securities by type
The fair value of other securities by type was as follows:
(dollars in millions)December 31, 2022December 31, 2021
Fixed maturity other securities: 
Bonds$23 $30 
Preferred stock *15 22 
Common stock *33 33 
Total $71 $85 
*    We employ an income equity strategy targeting investments in stocks with strong current dividend yields. Stocks included have a history of stable or increasing dividend payments.