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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Insurance Premiums [Line Items]  
Three months ending, March 31, 2018, Total Expected Future Premium Earnings $ 25
Three months ending, June 30, 2018, Total Expected Future Premium Earnings 24
Three months ending, September 30, 2018, Total Expected Future Premium Earnings 23
Three months ending, December 31, 2018, Total Expected Future Premium Earnings 23
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings 87
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 79
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 71
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 64
Five years ending, December 31, 2027, Total Expected Future Premium Earnings 225
Five years ending, December 31, 2032, Total Expected Future Premium Earnings 115
Five years ending, December 31, 2037 and thereafter, Total Expected Future Premium Earnings 107
Total Expected Future Premium Earnings 843
Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 752
Unearned Premium Revenue [Member] | March Thirty One Two Thousand Eighteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 729
Unearned Premium Revenue [Member] | June Thirty Two Thousand Eighteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 707
Unearned Premium Revenue [Member] | September Thirty Two Thousand Eighteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 686
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Eighteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 665
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Nineteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 587
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 516
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty One [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 452
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Two [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 395
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Seven [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 195
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Two [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 94
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Seven And Thereafter [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 0
Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2018, Total Expected Future Premium Earnings 12
Three months ending, June 30, 2018, Total Expected Future Premium Earnings 12
Three months ending, September 30, 2018, Total Expected Future Premium Earnings 11
Three months ending, December 31, 2018, Total Expected Future Premium Earnings 11
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings 41
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 37
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 33
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 30
Five years ending, December 31, 2027, Total Expected Future Premium Earnings 105
Five years ending, December 31, 2032, Total Expected Future Premium Earnings 54
Five years ending, December 31, 2037 and thereafter, Total Expected Future Premium Earnings 40
Total Expected Future Premium Earnings 386
Installments [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2018, Total Expected Future Premium Earnings 11
Three months ending, June 30, 2018, Total Expected Future Premium Earnings 10
Three months ending, September 30, 2018, Total Expected Future Premium Earnings 10
Three months ending, December 31, 2018, Total Expected Future Premium Earnings 10
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings 37
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 34
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 31
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 27
Five years ending, December 31, 2027, Total Expected Future Premium Earnings 95
Five years ending, December 31, 2032, Total Expected Future Premium Earnings 47
Five years ending, December 31, 2037 and thereafter, Total Expected Future Premium Earnings 54
Total Expected Future Premium Earnings 366
Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2018, Total Expected Future Premium Earnings 2
Three months ending, June 30, 2018, Total Expected Future Premium Earnings 2
Three months ending, September 30, 2018, Total Expected Future Premium Earnings 2
Three months ending, December 31, 2018, Total Expected Future Premium Earnings 2
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings 9
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 8
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 7
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 7
Five years ending, December 31, 2027, Total Expected Future Premium Earnings 25
Five years ending, December 31, 2032, Total Expected Future Premium Earnings 14
Five years ending, December 31, 2037 and thereafter, Total Expected Future Premium Earnings 13
Total Expected Future Premium Earnings $ 91