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Fair Value of Financial Instruments (Fair Value Hierarchy Table Presents The Company's Assets And Liabilities At Fair Value Not Recorded On The Company's Consolidated Balance Sheet) (Detail) - Value Disclosed At Fair Value Not Recorded At Fair Value [Member] - Fair Value Measurements Nonrecurring [Member] - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Carrying Reported Amount Fair Value Disclosure [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments $ 1 $ 3
Total assets 1 3
Long-term debt 2,741 2,585
Medium-term notes 403 [1] 455 [2]
Investment agreements 204 221
Total liabilities 3,360 3,264
Gross liability (recoverable) 540 522
Ceded recoverable (liability) 18 16
Fair Value [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 1 3
Total assets 1 3
Long-term debt 305 287
Medium-term notes 217 291
Investment agreements 217 243
Total liabilities 751 824
Gross liability (recoverable) 764 837
Ceded recoverable (liability) 19 20
Fair Value [Member] | Fair Value Inputs Level 1 [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 0 0
Total assets 0 0
Long-term debt 0 0
Medium-term notes 0 0
Investment agreements 0 0
Total liabilities 0 0
Gross liability (recoverable) 0 0
Ceded recoverable (liability) 0 0
Fair Value [Member] | Fair Value Inputs Level 2 [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 0 0
Total assets 0 0
Long-term debt 305 287
Medium-term notes 0 0
Investment agreements 0 0
Total liabilities 305 287
Gross liability (recoverable) 0 0
Ceded recoverable (liability) 0 0
Fair Value [Member] | Fair Value Inputs Level 3 [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 1 3
Total assets 1 3
Long-term debt 0 0
Medium-term notes 217 291
Investment agreements 217 243
Total liabilities 446 537
Gross liability (recoverable) 764 837
Ceded recoverable (liability) 19 20
Liabilities Of Consolidated Vies [Member] | Carrying Reported Amount Fair Value Disclosure [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity loans payable 12 3
Liabilities Of Consolidated Vies [Member] | Fair Value [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity loans payable 12 3
Liabilities Of Consolidated Vies [Member] | Fair Value [Member] | Fair Value Inputs Level 1 [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity loans payable 0 0
Liabilities Of Consolidated Vies [Member] | Fair Value [Member] | Fair Value Inputs Level 2 [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity loans payable 0 0
Liabilities Of Consolidated Vies [Member] | Fair Value [Member] | Fair Value Inputs Level 3 [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity loans payable $ 12 $ 3
[1] The carry value includes the complex interest calculations embedded in certain MTNs elected to be accounted for as separate derivatives that are reported together with the host contract. As of December 31, 2024, the Company had no embedded derivative assets and had embedded derivative liabilities of $2 million.
[2] The carry value includes the complex interest calculations embedded in certain MTNs elected to be accounted for as separate derivatives that are reported together with the host contract. As of December 31, 2023, the Company had embedded derivative assets and liabilities of $1 million and $3 million, respectively.