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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Premium Earnings) (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Insurance Premiums [Line Items]  
Three months ended, March 31, 2013, Total Expected Future Premium Earnings $ 85
Three months ended, June 30, 2013, Total Expected Future Premium Earnings 84
Three months ended, September 30, 2013, Total Expected Future Premium Earnings 81
Three months ended, December 31, 2013, Total Expected Future Premium Earnings 79
Twelve months ended, December 31, 2014, Total Expected Future Premium Earnings 296
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 270
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 248
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 226
Five years ended, December 31, 2022, Total Expected Future Premium Earnings 861
Five years ended, December 31, 2027, Total Expected Future Premium Earnings 523
Five years ended, December 31, 2032 and thereafter, Total Expected Future Premium Earnings 493
Total Expected Future Premium Earnings 3,246
Unearned Premium Revenue [Member]
 
Insurance Premiums [Line Items]  
Twelve months ended, December 31, 2012, Total Expected Future Premium Earnings 2,938
Three months ended, March 31, 2013, Total Expected Future Premium Earnings 2,860
Three months ended, June 30, 2013, Total Expected Future Premium Earnings 2,783
Three months ended, September 30, 2013, Total Expected Future Premium Earnings 2,709
Three months ended, December 31, 2013, Total Expected Future Premium Earnings 2,637
Twelve months ended, December 31, 2014, Total Expected Future Premium Earnings 2,368
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 2,123
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 1,898
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 1,693
Five years ended, December 31, 2022, Total Expected Future Premium Earnings 915
Five years ended, December 31, 2027, Total Expected Future Premium Earnings 442
Upfront [Member]
 
Insurance Premiums [Line Items]  
Three months ended, March 31, 2013, Total Expected Future Premium Earnings 46
Three months ended, June 30, 2013, Total Expected Future Premium Earnings 46
Three months ended, September 30, 2013, Total Expected Future Premium Earnings 44
Three months ended, December 31, 2013, Total Expected Future Premium Earnings 42
Twelve months ended, December 31, 2014, Total Expected Future Premium Earnings 159
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 143
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 130
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 120
Five years ended, December 31, 2022, Total Expected Future Premium Earnings 456
Five years ended, December 31, 2027, Total Expected Future Premium Earnings 268
Five years ended, December 31, 2032 and thereafter, Total Expected Future Premium Earnings 234
Total Expected Future Premium Earnings 1,688
Installments [Member]
 
Insurance Premiums [Line Items]  
Three months ended, March 31, 2013, Total Expected Future Premium Earnings 32
Three months ended, June 30, 2013, Total Expected Future Premium Earnings 31
Three months ended, September 30, 2013, Total Expected Future Premium Earnings 30
Three months ended, December 31, 2013, Total Expected Future Premium Earnings 30
Twelve months ended, December 31, 2014, Total Expected Future Premium Earnings 110
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 102
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 95
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 85
Five years ended, December 31, 2022, Total Expected Future Premium Earnings 322
Five years ended, December 31, 2027, Total Expected Future Premium Earnings 205
Five years ended, December 31, 2032 and thereafter, Total Expected Future Premium Earnings 208
Total Expected Future Premium Earnings 1,250
Accretion [Member]
 
Insurance Premiums [Line Items]  
Three months ended, March 31, 2013, Total Expected Future Premium Earnings 7
Three months ended, June 30, 2013, Total Expected Future Premium Earnings 7
Three months ended, September 30, 2013, Total Expected Future Premium Earnings 7
Three months ended, December 31, 2013, Total Expected Future Premium Earnings 7
Twelve months ended, December 31, 2014, Total Expected Future Premium Earnings 27
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 25
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 23
Twelve months ended, December 31, 2017, Total Expected Future Premium Earnings 21
Five years ended, December 31, 2022, Total Expected Future Premium Earnings 83
Five years ended, December 31, 2027, Total Expected Future Premium Earnings 50
Five years ended, December 31, 2032 and thereafter, Total Expected Future Premium Earnings 51
Total Expected Future Premium Earnings $ 308