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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail)
$ in Millions
Dec. 31, 2020
USD ($)
Insurance Premiums [Line Items]  
Three months ending, March 31, 2021, Total Expected Future Premium Earnings $ 14
Three months ending, June 30, 2021, Total Expected Future Premium Earnings 14
Three months ending, September 30, 2021, Total Expected Future Premium Earnings 14
Three months ending, December 31, 2021, Total Expected Future Premium Earnings 13
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 50
Twelve months ending, December 31, 2023, Total Expected Future Premium Earnings 43
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 40
Twelve months ending, December 31, 2025, Total Expected Future Premium Earnings 35
Five years ending, December 31, 2030, Total Expected Future Premium Earnings 115
Five years ending, December 31, 2035, Total Expected Future Premium Earnings 63
Five years ending, December 31, 2040 and thereafter, Total Expected Future Premium Earnings 59
Total Expected Future Premium Earnings 460
Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 405
Unearned Premium Revenue [Member] | March Thirty One Two Thousand Twenty One [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 392
Unearned Premium Revenue [Member] | June Thirty Two Thousand Twenty One [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 379
Unearned Premium Revenue [Member] | September Thirty Two Thousand Twenty One [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 367
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty One [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 355
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Two [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 310
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 271
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Four [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 235
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Five [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 204
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 104
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Five [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 50
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Fourty And Thereafter [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 0
Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2021, Total Expected Future Premium Earnings 6
Three months ending, June 30, 2021, Total Expected Future Premium Earnings 6
Three months ending, September 30, 2021, Total Expected Future Premium Earnings 6
Three months ending, December 31, 2021, Total Expected Future Premium Earnings 6
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 21
Twelve months ending, December 31, 2023, Total Expected Future Premium Earnings 19
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 17
Twelve months ending, December 31, 2025, Total Expected Future Premium Earnings 15
Five years ending, December 31, 2030, Total Expected Future Premium Earnings 50
Five years ending, December 31, 2035, Total Expected Future Premium Earnings 24
Five years ending, December 31, 2040 and thereafter, Total Expected Future Premium Earnings 16
Total Expected Future Premium Earnings 186
Installments [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2021, Total Expected Future Premium Earnings 7
Three months ending, June 30, 2021, Total Expected Future Premium Earnings 7
Three months ending, September 30, 2021, Total Expected Future Premium Earnings 6
Three months ending, December 31, 2021, Total Expected Future Premium Earnings 6
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 24
Twelve months ending, December 31, 2023, Total Expected Future Premium Earnings 20
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 19
Twelve months ending, December 31, 2025, Total Expected Future Premium Earnings 16
Five years ending, December 31, 2030, Total Expected Future Premium Earnings 50
Five years ending, December 31, 2035, Total Expected Future Premium Earnings 30
Five years ending, December 31, 2040 and thereafter, Total Expected Future Premium Earnings 34
Total Expected Future Premium Earnings 219
Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2021, Total Expected Future Premium Earnings 1
Three months ending, June 30, 2021, Total Expected Future Premium Earnings 1
Three months ending, September 30, 2021, Total Expected Future Premium Earnings 2
Three months ending, December 31, 2021, Total Expected Future Premium Earnings 1
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 5
Twelve months ending, December 31, 2023, Total Expected Future Premium Earnings 4
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 4
Twelve months ending, December 31, 2025, Total Expected Future Premium Earnings 4
Five years ending, December 31, 2030, Total Expected Future Premium Earnings 15
Five years ending, December 31, 2035, Total Expected Future Premium Earnings 9
Five years ending, December 31, 2040 and thereafter, Total Expected Future Premium Earnings 9
Total Expected Future Premium Earnings $ 55