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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Insurance Premiums [Line Items]  
Three months ending, March 31, 2019, Total Expected Future Premium Earnings $ 20
Three months ending, June 30, 2019, Total Expected Future Premium Earnings 19
Three months ending, September 30, 2019, Total Expected Future Premium Earnings 19
Three months ending, December 31, 2019, Total Expected Future Premium Earnings 19
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 69
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 61
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 55
Twelve months ending, December 31, 2023, Total Expected Future Premium Earnings 48
Five years ending, December 31, 2028, Total Expected Future Premium Earnings 171
Five years ending, December 31, 2033, Total Expected Future Premium Earnings 91
Five years ending, December 31, 2038 and thereafter, Total Expected Future Premium Earnings 90
Total Expected Future Premium Earnings 662
Unearned Premium Revenue [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 587
Unearned Premium Revenue [Member] | March Thirty One Two Thousand Nineteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 569
Unearned Premium Revenue [Member] | June Thirty Two Thousand Nineteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 552
Unearned Premium Revenue [Member] | September Thirty Two Thousand Nineteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 535
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Nineteen [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 518
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 456
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty One [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 401
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Two [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 352
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Three [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 309
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Eight [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 158
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Three [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 79
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Eight And Thereafter [Member]  
Insurance Premiums [Line Items]  
Unearned Premiums 0
Upfront [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2019, Total Expected Future Premium Earnings 9
Three months ending, June 30, 2019, Total Expected Future Premium Earnings 9
Three months ending, September 30, 2019, Total Expected Future Premium Earnings 9
Three months ending, December 31, 2019, Total Expected Future Premium Earnings 9
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 32
Twelve months ending, December 31, 2021, Total Expected Future Premium Earnings 28
Twelve months ending, December 31, 2022, Total Expected Future Premium Earnings 25
Twelve months ending, December 31, 2023, Total Expected Future Premium Earnings 22
Five years ending, December 31, 2028, Total Expected Future Premium Earnings 81
Five years ending, December 31, 2033, Total Expected Future Premium Earnings 42
Five years ending, December 31, 2038 and thereafter, Total Expected Future Premium Earnings 33
Total Expected Future Premium Earnings 299
Installments [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2019, Total Expected Future Premium Earnings 9
Three months ending, June 30, 2019, Total Expected Future Premium Earnings 8
Three months ending, September 30, 2019, Total Expected Future Premium Earnings 8
Three months ending, December 31, 2019, Total Expected Future Premium Earnings 8
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 30
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
Five years ending, December 31, 2028, Total Expected Future Premium Earnings 70
Five years ending, December 31, 2033, Total Expected Future Premium Earnings 37
Five years ending, December 31, 2038 and thereafter, Total Expected Future Premium Earnings 46
Total Expected Future Premium Earnings 288
Accretion [Member]  
Insurance Premiums [Line Items]  
Three months ending, March 31, 2019, Total Expected Future Premium Earnings 2
Three months ending, June 30, 2019, Total Expected Future Premium Earnings 2
Three months ending, September 30, 2019, Total Expected Future Premium Earnings 2
Three months ending, December 31, 2019, Total Expected Future Premium Earnings 2
Twelve months ending, December 31, 2020, Total Expected Future Premium Earnings 7
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
Five years ending, December 31, 2028, Total Expected Future Premium Earnings 20
Five years ending, December 31, 2033, Total Expected Future Premium Earnings 12
Five years ending, December 31, 2038 and thereafter, Total Expected Future Premium Earnings 11
Total Expected Future Premium Earnings $ 75