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Insurance Premiums (Tables)
 12 Months Ended
Dec. 31, 2013
Text Block [Abstract]  
Rollforward of Premiums Receivable
In millions                   
       Adjustments   
Premiums   Premiums Changes in Accretion of   Premiums 
Receivable as of Premium from New Expected Premiums   Receivable as of 
December 31, Payments Business Term of Receivable   December 31, 
2012 Received Written Policies Discount Other (1) 2013 
$1,228 $(135) $0 $(45) $28 $(25) $1,051 
__________                   
(1) - Primarily consists of unrealized gains (losses) due to foreign currency exchange rates.

In millions                   
       Adjustments   
Premiums   Premiums Changes in Accretion of   Premiums 
Receivable as of Premium from New Expected Premiums   Receivable as of 
December 31, Payments Business Term of Receivable   December 31, 
2011 Received Written Policies Discount Other (1) 2012 
$1,360 $(182) $5 $(57) $32 $70 $1,228 
__________                   
(1) - Primarily consists of unrealized gains (losses) due to foreign currency exchange rates.
Undiscounted Future Premiums By Period
   Expected 
   Collection of 
 In millions Premiums 
 Three months ended:    
 March 31, 2014 $24 
 June 30, 2014  37 
 September 30, 2014  25 
 December 31, 2014  30 
      
 Twelve months ended:    
 December 31, 2015  109 
 December 31, 2016  104 
 December 31, 2017  94 
 December 31, 2018  83 
      
 Five years ended:    
 December 31, 2023  336 
 December 31, 2028  243 
 December 31, 2033 and thereafter  263 
 Total $1,348 
Unearned Premium Reserve And Future Premium Earnings
               Total 
               Expected 
   Unearned Expected Future    Future 
   Premium  Premium Earnings    Premium 
 In millions Revenue Upfront Installments Accretion Earnings 
 December 31, 2013 $2,441             
                  
 Three months ended:                
 March 31, 2014  2,376 $38 $27 $7 $72 
 June 30, 2014  2,313  37  26  7  70 
 September 30, 2014  2,253  35  25  7  67 
 December 31, 2014  2,194  35  24  7  66 
                  
 Twelve months ended:                
 December 31, 2015  1,970  129  95  26  250 
 December 31, 2016  1,764  116  90  24  230 
 December 31, 2017  1,576  106  82  22  210 
 December 31, 2018  1,407  97  72  21  190 
                  
 Five years ended:                
 December 31, 2023  756  369  282  80  731 
 December 31, 2028  361  214  181  47  442 
 December 31, 2033 and thereafter  0  187  174  47  408 
 Total    $1,363 $1,078 $295 $2,736