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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
Mar. 31, 2025
Dec. 31, 2024
Carrying Reported Amount Fair Value Disclosure [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments $ 1 $ 1
Total assets 1 1
Long-term debt 2,780 2,741
Medium-term notes 408 [1] 403 [2]
Investment agreements 203 204
Total liabilities 3,397 3,360
Gross liability (recoverable) 522 540
Ceded recoverable (liability) 18 18
Fair Value [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 1 1
Total assets 1 1
Long-term debt 310 305
Medium-term notes 226 217
Investment agreements 216 217
Total liabilities 758 751
Gross liability (recoverable) 695 764
Ceded recoverable (liability) 18 19
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 310 305
Medium-term notes 0 0
Investment agreements 0 0
Total liabilities 310 305
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 1
Total assets 1 1
Long-term debt 0 0
Medium-term notes 226 217
Investment agreements 216 217
Total liabilities 448 446
Gross liability (recoverable) 695 764
Ceded recoverable (liability) 18 19
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 6 12
Liabilities Of Consolidated Vies [Member] | Fair Value [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity loans payable 6 12
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 $ 6 $ 12
[1] The carry value includes the complex interest calculations embedded in an MTN elected to be accounted for as a separate derivative that is reported together with the host contract. As of March 31, 2025, the Company had an embedded derivative liability of $1 million.
[2] The carry value includes the complex interest calculations embedded in an MTN elected to be accounted for as a separate derivative that is reported together with the host contract. As of December 31, 2024, the Company had an embedded derivative liability of $2 million.