v3.26.1
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, 2026
Dec. 31, 2025
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 2,879 2,843
Medium-term notes 427 [1] 424 [2]
Investment agreements 173 174
Total liabilities 3,486 3,448
Gross liability (recoverable) 556 583
Ceded recoverable (liability) 16 16
Fair Value [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 1 1
Total assets 1 1
Long-term debt 235 242
Medium-term notes 274 275
Investment agreements 183 187
Total liabilities 699 711
Gross liability (recoverable) 750 817
Ceded recoverable (liability) 16 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 235 242
Medium-term notes 0 0
Investment agreements 0 0
Total liabilities 235 242
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 274 275
Investment agreements 183 187
Total liabilities 464 469
Gross liability (recoverable) 750 817
Ceded recoverable (liability) 16 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 7 7
Liabilities Of Consolidated Vies [Member] | Fair Value [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Variable interest entity loans payable 7 7
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 $ 7 $ 7
[1] The carry value includes complex interest calculations for an MTN feature that is accounted for as a separate derivative and reported together with the host contract. As of March 31, 2026, the Company had an embedded derivative liability of $1 million.
[2] The carry value includes complex interest calculations for an MTN feature that is accounted for as a separate derivative and reported together with the host contract. As of December 31, 2025, the Company had an embedded derivative liability of $1 million.