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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail)
$ in Millions
Dec. 31, 2024
USD ($)
Insurance Premiums [Line Items]  
Total Expected Future Premium Earnings $ 234
Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 199
Upfront [Member]  
Insurance Premiums [Line Items]  
Total Expected Future Premium Earnings 83
Installments [Member]  
Insurance Premiums [Line Items]  
Total Expected Future Premium Earnings 116
Accretion [Member]  
Insurance Premiums [Line Items]  
Total Expected Future Premium Earnings 35
March Thirty One Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2025, Total Expected Future Premium Earnings 7
March Thirty One Two Thousand Twenty Five [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2025, Total Expected Future Premium Earnings 193
March Thirty One Two Thousand Twenty Five [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2025, Total Expected Future Premium Earnings 3
March Thirty One Two Thousand Twenty Five [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2025, Total Expected Future Premium Earnings 3
March Thirty One Two Thousand Twenty Five [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2025, Total Expected Future Premium Earnings 1
June Thirty Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Three months ending, June 30, 2025, Total Expected Future Premium Earnings 8
June Thirty Two Thousand Twenty Five [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Three months ending, June 30, 2025, Total Expected Future Premium Earnings 186
June Thirty Two Thousand Twenty Five [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ending, June 30, 2025, Total Expected Future Premium Earnings 3
June Thirty Two Thousand Twenty Five [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Three months ending, June 30, 2025, Total Expected Future Premium Earnings 4
June Thirty Two Thousand Twenty Five [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ending, June 30, 2025, Total Expected Future Premium Earnings 1
September Thirty Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Three months ending, September 30, 2025, Total Expected Future Premium Earnings 7
September Thirty Two Thousand Twenty Five [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Three months ending, September 30, 2025, Total Expected Future Premium Earnings 180
September Thirty Two Thousand Twenty Five [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ending, September 30, 2025, Total Expected Future Premium Earnings 3
September Thirty Two Thousand Twenty Five [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Three months ending, September 30, 2025, Total Expected Future Premium Earnings 3
September Thirty Two Thousand Twenty Five [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ending, September 30, 2025, Total Expected Future Premium Earnings 1
December Thirty One Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Three months ending, December 31, 2025, Total Expected Future Premium Earnings 7
December Thirty One Two Thousand Twenty Five [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Three months ending, December 31, 2025, Total Expected Future Premium Earnings 174
December Thirty One Two Thousand Twenty Five [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ending, December 31, 2025, Total Expected Future Premium Earnings 3
December Thirty One Two Thousand Twenty Five [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Three months ending, December 31, 2025, Total Expected Future Premium Earnings 3
December Thirty One Two Thousand Twenty Five [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ending, December 31, 2025, Total Expected Future Premium Earnings 1
December Thirty One Two Thousand Twenty Six [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2026, Total Expected Future Premium Earnings 24
December Thirty One Two Thousand Twenty Six [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2026, Total Expected Future Premium Earnings 153
December Thirty One Two Thousand Twenty Six [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2026, Total Expected Future Premium Earnings 10
December Thirty One Two Thousand Twenty Six [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2026, Total Expected Future Premium Earnings 11
December Thirty One Two Thousand Twenty Six [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2026, Total Expected Future Premium Earnings 3
December Thirty One Two Thousand Twenty Seven [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2027, Total Expected Future Premium Earnings 21
December Thirty One Two Thousand Twenty Seven [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2027, Total Expected Future Premium Earnings 135
December Thirty One Two Thousand Twenty Seven [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2027, Total Expected Future Premium Earnings 9
December Thirty One Two Thousand Twenty Seven [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2027, Total Expected Future Premium Earnings 9
December Thirty One Two Thousand Twenty Seven [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2027, Total Expected Future Premium Earnings 3
December Thirty One Two Thousand Twenty Eight [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2028, Total Expected Future Premium Earnings 19
December Thirty One Two Thousand Twenty Eight [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2028, Total Expected Future Premium Earnings 119
December Thirty One Two Thousand Twenty Eight [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2028, Total Expected Future Premium Earnings 8
December Thirty One Two Thousand Twenty Eight [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2028, Total Expected Future Premium Earnings 8
December Thirty One Two Thousand Twenty Eight [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2028, Total Expected Future Premium Earnings 3
December Thirty One Two Thousand Twenty Nine [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2029, Total Expected Future Premium Earnings 17
December Thirty One Two Thousand Twenty Nine [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2029, Total Expected Future Premium Earnings 105
December Thirty One Two Thousand Twenty Nine [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2029, Total Expected Future Premium Earnings 7
December Thirty One Two Thousand Twenty Nine [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2029, Total Expected Future Premium Earnings 7
December Thirty One Two Thousand Twenty Nine [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Twelve months ending, December 31, 2029, Total Expected Future Premium Earnings 3
December Thirty One Two Thousand Thirty Four [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2039, Total Expected Future Premium Earnings 61
December Thirty One Two Thousand Thirty Four [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2039, Total Expected Future Premium Earnings 54
December Thirty One Two Thousand Thirty Four [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2039, Total Expected Future Premium Earnings 21
December Thirty One Two Thousand Thirty Four [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2039, Total Expected Future Premium Earnings 30
December Thirty One Two Thousand Thirty Four [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2039, Total Expected Future Premium Earnings 10
December Thirty One Two Thousand Thirty Nine [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2034, Total Expected Future Premium Earnings 35
December Thirty One Two Thousand Thirty Nine [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2034, Total Expected Future Premium Earnings 25
December Thirty One Two Thousand Thirty Nine [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2034, Total Expected Future Premium Earnings 9
December Thirty One Two Thousand Thirty Nine [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2034, Total Expected Future Premium Earnings 20
December Thirty One Two Thousand Thirty Nine [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2034, Total Expected Future Premium Earnings 6
December Thirty One Two Thousand Forty Four and Thereafter [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2044 and thereafter, Total Expected Future Premium Earnings 28
December Thirty One Two Thousand Forty Four and Thereafter [Member] | Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2044 and thereafter, Total Expected Future Premium Earnings 0
December Thirty One Two Thousand Forty Four and Thereafter [Member] | Upfront [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2044 and thereafter, Total Expected Future Premium Earnings 7
December Thirty One Two Thousand Forty Four and Thereafter [Member] | Installments [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2044 and thereafter, Total Expected Future Premium Earnings 18
December Thirty One Two Thousand Forty Four and Thereafter [Member] | Accretion [Member]  
Insurance Premiums [Line Items]  
Five years ending, December 31, 2044 and thereafter, Total Expected Future Premium Earnings $ 3