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Insurance Premiums (Undiscounted Future Amount Of Premiums Expected To Be Collected And Period Which Those Collections Are Expected To Occur) (Detail)
$ in Millions
Dec. 31, 2023
USD ($)
Insurance Premiums [Abstract]  
Three months ending, March 31, 2024, Expected Collection of Premiums $ 2
Three months ending, June 30, 2024, Expected Collection of Premiums 5
Three months ending, September 30, 2024, Expected Collection of Premiums 4
Three months ending, December 31, 2024, Expected Collection of Premiums 6
Twelve months ending, December 31, 2025, Expected Collection of Premiums 15
Twelve months ending, December 31, 2026, Expected Collection of Premiums 13
Twelve months ending, December 31, 2027, Expected Collection of Premiums 12
Twelve months ending, December 31, 2028, Expected Collection of Premiums 12
Five years ending, December 31, 2033, Expected Collection of Premiums 47
Five years ending, December 31, 2038, Expected Collection of Premiums 34
Five years ending, December 31, 2043 and thereafter, Expected Collection of Premiums 35
Total, Expected Collection of Premiums $ 185