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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail)
$ in Millions
Dec. 31, 2016
USD ($)
Insurance Premiums [Line Items]  
Three months ending, March 31, 2017, Total Expected Future Premium Earnings $ 31
Three months ending, June 30, 2017, Total Expected Future Premium Earnings 31
Three months ending, September 30, 2017, Total Expected Future Premium Earnings 29
Three months ending, December 31, 2017, Total Expected Future Premium Earnings 28
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings 106
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings 96
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 87
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 79
Five years ending, December 31, 2026, Total Expected Future Premium Earnings 287
Five years ending, December 31, 2031, Total Expected Future Premium Earnings 153
Five years ending, December 31, 2036 and thereafter, Total Expected Future Premium Earnings 141
Total Expected Future Premium Earnings 1,068
Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 958
Unearned Premium Revenue [Member] | March Thirty One Two Thousand Seventeen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 930
Unearned Premium Revenue [Member] | June Thirty Two Thousand Seventeen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 902
Unearned Premium Revenue [Member] | September Thirty Two Thousand Seventeen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 876
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Seventeen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 850
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Eighteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 754
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Nineteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 667
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 588
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty One [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 516
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Six [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 258
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty One [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 123
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Six And Thereafter [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 0
Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2017, Total Expected Future Premium Earnings 16
Three months ending, June 30, 2017, Total Expected Future Premium Earnings 16
Three months ending, September 30, 2017, Total Expected Future Premium Earnings 15
Three months ending, December 31, 2017, Total Expected Future Premium Earnings 15
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings 55
Twelve months ending, December 31, 2019, Total Expected Future Premium Earnings 50
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 45
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 40
Five years ending, December 31, 2026, Total Expected Future Premium Earnings 147
Five years ending, December 31, 2031, Total Expected Future Premium Earnings 78
Five years ending, December 31, 2036 and thereafter, Total Expected Future Premium Earnings 58
Total Expected Future Premium Earnings 535
Installments [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2017, Total Expected Future Premium Earnings 12
Three months ending, June 30, 2017, Total Expected Future Premium Earnings 12
Three months ending, September 30, 2017, Total Expected Future Premium Earnings 11
Three months ending, December 31, 2017, Total Expected Future Premium Earnings 11
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings 41
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 32
Five years ending, December 31, 2026, Total Expected Future Premium Earnings 111
Five years ending, December 31, 2031, Total Expected Future Premium Earnings 57
Five years ending, December 31, 2036 and thereafter, Total Expected Future Premium Earnings 65
Total Expected Future Premium Earnings 423
Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2017, Total Expected Future Premium Earnings 3
Three months ending, June 30, 2017, Total Expected Future Premium Earnings 3
Three months ending, September 30, 2017, Total Expected Future Premium Earnings 3
Three months ending, December 31, 2017, Total Expected Future Premium Earnings 2
Twelve months ending, December 31, 2018, Total Expected Future Premium Earnings 10
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
Five years ending, December 31, 2026, Total Expected Future Premium Earnings 29
Five years ending, December 31, 2031, Total Expected Future Premium Earnings 18
Five years ending, December 31, 2036 and thereafter, Total Expected Future Premium Earnings 18
Total Expected Future Premium Earnings $ 110