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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail)
$ in Millions
Dec. 31, 2022
USD ($)
Insurance Premiums [Line Items]  
Total Expected Future Premium Earnings $ 310
March Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2023, Total Expected Future Premium Earnings 9
June Thirty Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, June 30, 2023, Total Expected Future Premium Earnings 9
September Thirty Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, September 30, 2023, Total Expected Future Premium Earnings 9
December Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, December 31, 2023, Total Expected Future Premium Earnings 9
December Thirty One Two Thousand Twenty Four [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 33
December Thirty One Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2025, Total Expected Future Premium Earnings 29
December Thirty One Two Thousand Twenty Six [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2026, Total Expected Future Premium Earnings 25
December Thirty One Two Thousand Twenty Seven [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2027, Total Expected Future Premium Earnings 22
December Thirty One Two Thousand Twenty Thirty Two [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2032, Total Expected Future Premium Earnings 79
December Thirty One Two Thousand Twenty Thirty Seven [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2037, Total Expected Future Premium Earnings 46
December Thirty One Two Thousand Fourty Two And Thereafter [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2042 and thereafter, Total Expected Future Premium Earnings 40
Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 266
Unearned Premium Revenue [Member] | March Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2023, Total Expected Future Premium Earnings 258
Unearned Premium Revenue [Member] | June Thirty Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, June 30, 2023, Total Expected Future Premium Earnings 250
Unearned Premium Revenue [Member] | September Thirty Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, September 30, 2023, Total Expected Future Premium Earnings 242
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, December 31, 2023, Total Expected Future Premium Earnings 234
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Four [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 205
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2025, Total Expected Future Premium Earnings 180
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Six [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2026, Total Expected Future Premium Earnings 158
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Seven [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2027, Total Expected Future Premium Earnings 139
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Thirty Two [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2032, Total Expected Future Premium Earnings 73
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Thirty Seven [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2037, Total Expected Future Premium Earnings 35
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Fourty Two And Thereafter [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2042 and thereafter, Total Expected Future Premium Earnings 0
Upfront [Member]  
Insurance Premiums [Line Items]  
Total Expected Future Premium Earnings 119
Upfront [Member] | March Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2023, Total Expected Future Premium Earnings 4
Upfront [Member] | June Thirty Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, June 30, 2023, Total Expected Future Premium Earnings 4
Upfront [Member] | September Thirty Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, September 30, 2023, Total Expected Future Premium Earnings 4
Upfront [Member] | December Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, December 31, 2023, Total Expected Future Premium Earnings 4
Upfront [Member] | December Thirty One Two Thousand Twenty Four [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 14
Upfront [Member] | December Thirty One Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2025, Total Expected Future Premium Earnings 13
Upfront [Member] | December Thirty One Two Thousand Twenty Six [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2026, Total Expected Future Premium Earnings 11
Upfront [Member] | December Thirty One Two Thousand Twenty Seven [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2027, Total Expected Future Premium Earnings 10
Upfront [Member] | December Thirty One Two Thousand Twenty Thirty Two [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2032, Total Expected Future Premium Earnings 31
Upfront [Member] | December Thirty One Two Thousand Twenty Thirty Seven [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2037, Total Expected Future Premium Earnings 14
Upfront [Member] | December Thirty One Two Thousand Fourty Two And Thereafter [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2042 and thereafter, Total Expected Future Premium Earnings 10
Installments [Member]  
Insurance Premiums [Line Items]  
Total Expected Future Premium Earnings 147
Installments [Member] | March Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2023, Total Expected Future Premium Earnings 4
Installments [Member] | June Thirty Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, June 30, 2023, Total Expected Future Premium Earnings 4
Installments [Member] | September Thirty Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, September 30, 2023, Total Expected Future Premium Earnings 4
Installments [Member] | December Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, December 31, 2023, Total Expected Future Premium Earnings 4
Installments [Member] | December Thirty One Two Thousand Twenty Four [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 15
Installments [Member] | December Thirty One Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2025, Total Expected Future Premium Earnings 12
Installments [Member] | December Thirty One Two Thousand Twenty Six [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2026, Total Expected Future Premium Earnings 11
Installments [Member] | December Thirty One Two Thousand Twenty Seven [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2027, Total Expected Future Premium Earnings 9
Installments [Member] | December Thirty One Two Thousand Twenty Thirty Two [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2032, Total Expected Future Premium Earnings 35
Installments [Member] | December Thirty One Two Thousand Twenty Thirty Seven [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2037, Total Expected Future Premium Earnings 24
Installments [Member] | December Thirty One Two Thousand Fourty Two And Thereafter [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2042 and thereafter, Total Expected Future Premium Earnings 25
Accretion [Member]  
Insurance Premiums [Line Items]  
Total Expected Future Premium Earnings 44
Accretion [Member] | March Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2023, Total Expected Future Premium Earnings 1
Accretion [Member] | June Thirty Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, June 30, 2023, Total Expected Future Premium Earnings 1
Accretion [Member] | September Thirty Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, September 30, 2023, Total Expected Future Premium Earnings 1
Accretion [Member] | December Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Three months ending, December 31, 2023, Total Expected Future Premium Earnings 1
Accretion [Member] | December Thirty One Two Thousand Twenty Four [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 4
Accretion [Member] | December Thirty One Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2025, Total Expected Future Premium Earnings 4
Accretion [Member] | December Thirty One Two Thousand Twenty Six [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2026, Total Expected Future Premium Earnings 3
Accretion [Member] | December Thirty One Two Thousand Twenty Seven [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2027, Total Expected Future Premium Earnings 3
Accretion [Member] | December Thirty One Two Thousand Twenty Thirty Two [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2032, Total Expected Future Premium Earnings 13
Accretion [Member] | December Thirty One Two Thousand Twenty Thirty Seven [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2037, Total Expected Future Premium Earnings 8
Accretion [Member] | December Thirty One Two Thousand Fourty Two And Thereafter [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2042 and thereafter, Total Expected Future Premium Earnings $ 5