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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
Insurance Premiums [Line Items]  
Three months ending, March 31, 2020, Total Expected Future Premium Earnings $ 18
Three months ending, June 30, 2020, Total Expected Future Premium Earnings 17
Three months ending, September 30, 2020, Total Expected Future Premium Earnings 16
Three months ending, December 31, 2020, Total Expected Future Premium Earnings 16
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 59
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 53
Twelve months ending, December 31, 2023, Total Expected Future Premium Earnings 46
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 42
Five years ending, December 31, 2029, Total Expected Future Premium Earnings 140
Five years ending, December 31, 2034, Total Expected Future Premium Earnings 74
Five years ending, December 31, 2039 and thereafter, Total Expected Future Premium Earnings 66
Total Expected Future Premium Earnings 547
Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 482
Unearned Premium Revenue [Member] | March Thirty One Two Thousand Twenty [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 466
Unearned Premium Revenue [Member] | June Thirty Two Thousand Twenty [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 451
Unearned Premium Revenue [Member] | September Thirty Two Thousand Twenty [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 437
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 423
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty One [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 370
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Two [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 323
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 282
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Four [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 245
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Nine [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 122
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty thirty Four [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 59
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Nine And Thereafter [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 0
Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2020, Total Expected Future Premium Earnings 8
Three months ending, June 30, 2020, Total Expected Future Premium Earnings 8
Three months ending, September 30, 2020, Total Expected Future Premium Earnings 7
Three months ending, December 31, 2020, Total Expected Future Premium Earnings 7
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 26
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 23
Twelve months ending, December 31, 2023, Total Expected Future Premium Earnings 20
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 18
Five years ending, December 31, 2029, Total Expected Future Premium Earnings 63
Five years ending, December 31, 2034, Total Expected Future Premium Earnings 29
Five years ending, December 31, 2039 and thereafter, Total Expected Future Premium Earnings 20
Total Expected Future Premium Earnings 229
Installments [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2020, Total Expected Future Premium Earnings 8
Three months ending, June 30, 2020, Total Expected Future Premium Earnings 7
Three months ending, September 30, 2020, Total Expected Future Premium Earnings 7
Three months ending, December 31, 2020, Total Expected Future Premium Earnings 7
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 27
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 24
Twelve months ending, December 31, 2023, Total Expected Future Premium Earnings 21
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 19
Five years ending, December 31, 2029, Total Expected Future Premium Earnings 60
Five years ending, December 31, 2034, Total Expected Future Premium Earnings 34
Five years ending, December 31, 2039 and thereafter, Total Expected Future Premium Earnings 39
Total Expected Future Premium Earnings 253
Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2020, Total Expected Future Premium Earnings 2
Three months ending, June 30, 2020, Total Expected Future Premium Earnings 2
Three months ending, September 30, 2020, Total Expected Future Premium Earnings 2
Three months ending, December 31, 2020, Total Expected Future Premium Earnings 2
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 6
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 6
Twelve months ending, December 31, 2023, Total Expected Future Premium Earnings 5
Twelve months ending, December 31, 2024, Total Expected Future Premium Earnings 5
Five years ending, December 31, 2029, Total Expected Future Premium Earnings 17
Five years ending, December 31, 2034, Total Expected Future Premium Earnings 11
Five years ending, December 31, 2039 and thereafter, Total Expected Future Premium Earnings 7
Total Expected Future Premium Earnings $ 65