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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
Jun. 30, 2024
Dec. 31, 2023
Carrying Reported Amount Fair Value Disclosure [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments $ 2 $ 3
Total assets 2 3
Long-term debt 2,663 2,585
Medium-term notes 396 [1] 455 [2]
Investment agreements 221 221
Variable interest entity loans payable 6 3
Total liabilities 3,286 3,264
Gross liability (recoverable) 651 522
Ceded recoverable (liability) 22 16
Fair Value [Member]    
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]    
Other investments 2 3
Total assets 2 3
Long-term debt 320 287
Medium-term notes 213 291
Investment agreements 236 243
Variable interest entity loans payable 6 3
Total liabilities 775 824
Gross liability (recoverable) 893 837
Ceded recoverable (liability) 20 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
Variable interest entity loans payable 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 320 287
Medium-term notes 0 0
Investment agreements 0 0
Variable interest entity loans payable 0 0
Total liabilities 320 287
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 2 3
Total assets 2 3
Long-term debt 0 0
Medium-term notes 213 291
Investment agreements 236 243
Variable interest entity loans payable 6 3
Total liabilities 455 537
Gross liability (recoverable) 893 837
Ceded recoverable (liability) $ 20 $ 20
[1] The carry value includes the complex interest calculations embedded derivatives in certain MTNs that are reported together with the host contract. As of June 30, 2024, the Company had no embedded derivative assets and had embedded derivative liabilities of $1 million.
[2] The carry value includes the complex interest calculations embedded derivatives in certain MTNs 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.