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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Earnings) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Insurance Premiums [Line Items]  
Three months ended, March 31, 2014, Total Expected Future Premium Earnings $ 72
Three months ended, June 30, 2014, Total Expected Future Premium Earnings 70
Three months ended, September 30, 2014, Total Expected Future Premium Earnings 67
Three months ended, December 31, 2014, Total Expected Future Premium Earnings 66
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 250
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 230
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 210
Twelve months ended, December 31, 2018, Total Expected Future Premium Earnings 190
Five years ended, December 31, 2023, Total Expected Future Premium Earnings 731
Five years ended, December 31, 2028, Total Expected Future Premium Earnings 442
Five years ended, December 31, 2033 and thereafter, Total Expected Future Premium Earnings 408
Total Expected Future Premium Earnings 2,736
Unearned Premium Revenue [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 2,441
Unearned Premium Revenue [Member] | March Thirty One Two Thousand Fourteen [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 2,376
Unearned Premium Revenue [Member] | June Thirty Two Thousand Fourteen [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 2,313
Unearned Premium Revenue [Member] | September Thirty Two Thousand Fourteen [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 2,253
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Fourteen [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 2,194
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Fifteen [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 1,970
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Sixteen [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 1,764
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Seventeen [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 1,576
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Eighteen [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 1,407
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Three [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 756
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Twenty Eight [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 361
Unearned Premium Revenue [Member] | December Thirty One Two Thousand Thirty Three And Thereafter [Member]
 
Insurance Premiums [Line Items]  
Unearned Premiums 0
Upfront [Member]
 
Insurance Premiums [Line Items]  
Three months ended, March 31, 2014, Total Expected Future Premium Earnings 38
Three months ended, June 30, 2014, Total Expected Future Premium Earnings 37
Three months ended, September 30, 2014, Total Expected Future Premium Earnings 35
Three months ended, December 31, 2014, Total Expected Future Premium Earnings 35
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 129
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 116
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 106
Twelve months ended, December 31, 2018, Total Expected Future Premium Earnings 97
Five years ended, December 31, 2023, Total Expected Future Premium Earnings 369
Five years ended, December 31, 2028, Total Expected Future Premium Earnings 214
Five years ended, December 31, 2033 and thereafter, Total Expected Future Premium Earnings 187
Total Expected Future Premium Earnings 1,363
Installments [Member]
 
Insurance Premiums [Line Items]  
Three months ended, March 31, 2014, Total Expected Future Premium Earnings 27
Three months ended, June 30, 2014, Total Expected Future Premium Earnings 26
Three months ended, September 30, 2014, Total Expected Future Premium Earnings 25
Three months ended, December 31, 2014, Total Expected Future Premium Earnings 24
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 95
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 90
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 82
Twelve months ended, December 31, 2018, Total Expected Future Premium Earnings 72
Five years ended, December 31, 2023, Total Expected Future Premium Earnings 282
Five years ended, December 31, 2028, Total Expected Future Premium Earnings 181
Five years ended, December 31, 2033 and thereafter, Total Expected Future Premium Earnings 174
Total Expected Future Premium Earnings 1,078
Accretion [Member]
 
Insurance Premiums [Line Items]  
Three months ended, March 31, 2014, Total Expected Future Premium Earnings 7
Three months ended, June 30, 2014, Total Expected Future Premium Earnings 7
Three months ended, September 30, 2014, Total Expected Future Premium Earnings 7
Three months ended, December 31, 2014, Total Expected Future Premium Earnings 7
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 26
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 24
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 22
Twelve months ended, December 31, 2018, Total Expected Future Premium Earnings 21
Five years ended, December 31, 2023, Total Expected Future Premium Earnings 80
Five years ended, December 31, 2028, Total Expected Future Premium Earnings 47
Five years ended, December 31, 2033 and thereafter, Total Expected Future Premium Earnings 47
Total Expected Future Premium Earnings $ 295