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Insurance Premiums (Unearned Premium Revenue Balance And Future Expected Premium Earnings) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Twelve months ended, December 31, 2011, Total Expected Future Premium Earnings   
Three months ended, March 31, 2012, Total Expected Future Premium Earnings 104
Three months ended, June 30, 2012, Total Expected Future Premium Earnings 101
Three months ended, September 30, 2012, Total Expected Future Premium Earnings 97
Three months ended, December 31, 2012, Total Expected Future Premium Earnings 92
Twelve months ended, December 31, 2013, Total Expected Future Premium Earnings 353
Twelve months ended, December 31, 2014, Total Expected Future Premium Earnings 322
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 296
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 271
Five years ended, December 31, 2021, Total Expected Future Premium Earnings 1,030
Five years ended, December 31, 2026, Total Expected Future Premium Earnings 627
Five years ended, December 31, 2031 and thereafter, Total Expected Future 596
Total Expected Future Premium Earnings 3,889
Unearned Premium Revenue [Member]
 
Twelve months ended, December 31, 2011, Total Expected Future Premium Earnings 3,515
Three months ended, March 31, 2012, Total Expected Future Premium Earnings 3,420
Three months ended, June 30, 2012, Total Expected Future Premium Earnings 3,328
Three months ended, September 30, 2012, Total Expected Future Premium Earnings 3,240
Three months ended, December 31, 2012, Total Expected Future Premium Earnings 3,156
Twelve months ended, December 31, 2013, Total Expected Future Premium Earnings 2,835
Twelve months ended, December 31, 2014, Total Expected Future Premium Earnings 2,543
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 2,275
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 2,030
Five years ended, December 31, 2021, Total Expected Future Premium Earnings 1,099
Five years ended, December 31, 2026, Total Expected Future Premium Earnings 533
Five years ended, December 31, 2031 and thereafter, Total Expected Future   
Upfront [Member]
 
Twelve months ended, December 31, 2011, Total Expected Future Premium Earnings   
Three months ended, March 31, 2012, Total Expected Future Premium Earnings 55
Three months ended, June 30, 2012, Total Expected Future Premium Earnings 54
Three months ended, September 30, 2012, Total Expected Future Premium Earnings 53
Three months ended, December 31, 2012, Total Expected Future Premium Earnings 51
Twelve months ended, December 31, 2013, Total Expected Future Premium Earnings 195
Twelve months ended, December 31, 2014, Total Expected Future Premium Earnings 180
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 165
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 150
Five years ended, December 31, 2021, Total Expected Future Premium Earnings 581
Five years ended, December 31, 2026, Total Expected Future Premium Earnings 346
Five years ended, December 31, 2031 and thereafter, Total Expected Future 296
Total Expected Future Premium Earnings 2,126
Installments [Member]
 
Twelve months ended, December 31, 2011, Total Expected Future Premium Earnings   
Three months ended, March 31, 2012, Total Expected Future Premium Earnings 40
Three months ended, June 30, 2012, Total Expected Future Premium Earnings 38
Three months ended, September 30, 2012, Total Expected Future Premium Earnings 35
Three months ended, December 31, 2012, Total Expected Future Premium Earnings 33
Twelve months ended, December 31, 2013, Total Expected Future Premium Earnings 126
Twelve months ended, December 31, 2014, Total Expected Future Premium Earnings 112
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 103
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 95
Five years ended, December 31, 2021, Total Expected Future Premium Earnings 350
Five years ended, December 31, 2026, Total Expected Future Premium Earnings 220
Five years ended, December 31, 2031 and thereafter, Total Expected Future 237
Total Expected Future Premium Earnings 1,389
Accretion [Member]
 
Twelve months ended, December 31, 2011, Total Expected Future Premium Earnings   
Three months ended, March 31, 2012, Total Expected Future Premium Earnings 9
Three months ended, June 30, 2012, Total Expected Future Premium Earnings 9
Three months ended, September 30, 2012, Total Expected Future Premium Earnings 9
Three months ended, December 31, 2012, Total Expected Future Premium Earnings 8
Twelve months ended, December 31, 2013, Total Expected Future Premium Earnings 32
Twelve months ended, December 31, 2014, Total Expected Future Premium Earnings 30
Twelve months ended, December 31, 2015, Total Expected Future Premium Earnings 28
Twelve months ended, December 31, 2016, Total Expected Future Premium Earnings 26
Five years ended, December 31, 2021, Total Expected Future Premium Earnings 99
Five years ended, December 31, 2026, Total Expected Future Premium Earnings 61
Five years ended, December 31, 2031 and thereafter, Total Expected Future 63
Total Expected Future Premium Earnings $ 374