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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Components of long-term debt    
Total long-term debt $ 9,520 $ 10,592
Scheduled principal payments on long-term debt    
2012 2,694  
2013 799  
2014 842  
2015 1,173  
2016 613  
All subsequent years 3,399  
Long Term Debt (Textual) [Abstract]    
Real Estate Loans and securities pledged 428 335
Parent Company [Member]
   
Components of long-term debt    
Total long-term debt 4,299 4,181
Scheduled principal payments on long-term debt    
2012 438  
2013 762  
2014 0  
2015 766  
2016 0  
All subsequent years 2,333  
Subsidiaries [Member]
   
Components of long-term debt    
Total long-term debt 5,221 6,411
Scheduled principal payments on long-term debt    
2012 2,256  
2013 37  
2014 842  
2015 407  
2016 613  
All subsequent years 1,066  
Senior medium-term notes due through 2015 [Member]
   
Components of long-term debt    
Senior medium-term notes 3,074 2,193
Long Term Debt (Textual) [Abstract]    
Long-term debt weighted average interest rate 4.49% 3.77%
Senior medium-term notes due through 2039 [Member]
   
Components of long-term debt    
Senior medium-term notes 1,494 1,551
Long Term Debt (Textual) [Abstract]    
Long-term debt weighted average interest rate 3.91% 3.87%
Senior Euro medium-term notes due through 2011 [Member]
   
Components of long-term debt    
Senior medium-term notes 0 40
Long Term Debt (Textual) [Abstract]    
Long-term debt weighted average interest rate   0.60%
Senior Euro medium-term notes due through 2013 [Member]
   
Components of long-term debt    
Senior medium-term notes 579 1,118
Long Term Debt (Textual) [Abstract]    
Long-term debt weighted average interest rate 0.59% 0.44%
1.112% Subordinated notes due 2028 [Member]
   
Components of long-term debt    
Subordinated long-term notes 162 159
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 1.112%  
6.875% Subordinated notes due 2029 [Member]
   
Components of long-term debt    
Subordinated long-term notes 118 101
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 6.875%  
7.750% Subordinated notes due 2029 [Member]
   
Components of long-term debt    
Subordinated long-term notes 152 129
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 7.75%  
5.875% Subordinated notes due 2033 [Member]
   
Components of long-term debt    
Subordinated long-term notes 0 128
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 5.875%  
6.125% Subordinated notes due 2033 [Member]
   
Components of long-term debt    
Subordinated long-term notes 0 61
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 6.125%  
5.700% Subordinated notes due 2035 [Member]
   
Components of long-term debt    
Subordinated long-term notes 195 196
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 5.70%  
7.000% Subordinated notes due 2066 [Member]
   
Components of long-term debt    
Subordinated long-term notes 0 197
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 7.00%  
6.750% Subordinated notes due 2066 [Member]
   
Components of long-term debt    
Subordinated long-term notes 0 329
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 6.75%  
8.000% Subordinated notes due 2068 [Member]
   
Components of long-term debt    
Subordinated long-term notes 598 597
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 8.00%  
9.580% Subordinated notes due 2027 [Member]
   
Components of long-term debt    
Subordinated long-term notes 0 21
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 9.58%  
3.853% Subordinated notes due 2031 [Member]
   
Components of long-term debt    
Subordinated long-term notes 0 20
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 3.853%  
3.078% Subordinated notes due 2034 [Member]
   
Components of long-term debt    
Subordinated long-term notes 0 10
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 3.078%  
7.413% Subordinated remarketable notes due 2027 [Member]
   
Components of long-term debt    
Subordinated long-term notes 265 263
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 7.413%  
7.00% Subordinated notes due 2011 [Member]
   
Components of long-term debt    
Subordinated long-term notes 0 505
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 7.00%  
7.30% Subordinated notes due 2011 [Member]
   
Components of long-term debt    
Subordinated long-term notes 0 109
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 7.30%  
5.70% Subordinated notes due 2012 [Member]
   
Components of long-term debt    
Subordinated long-term notes 308 321
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 5.70%  
5.80% Subordinated notes due 2014 [Member]
   
Components of long-term debt    
Subordinated long-term notes 830 841
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 5.80%  
4.95% Subordinated notes due 2015 [Member]
   
Components of long-term debt    
Subordinated long-term notes 252 252
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 4.95%  
5.45% Subordinated notes due 2016 [Member]
   
Components of long-term debt    
Subordinated long-term notes 573 561
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 5.45%  
5.70% Subordinated notes due 2017 [Member]
   
Components of long-term debt    
Subordinated long-term notes 242 230
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 5.70%  
4.625% Subordinated notes due 2018 [Member]
   
Components of long-term debt    
Subordinated long-term notes 106 97
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 4.625%  
6.95% Subordinated notes due 2028 [Member]
   
Components of long-term debt    
Subordinated long-term notes 300 300
Long Term Debt (Textual) [Abstract]    
Interest rate Subordinated notes 6.95%  
Lease financing debt due through 2015 [Member]
   
Components of long-term debt    
Lease financing debt due through 2015 19 38
Long Term Debt (Textual) [Abstract]    
Long-term debt weighted average interest rate 5.44% 5.89%
Federal Home Loan Bank [Member]
   
Components of long-term debt    
Federal Home Loan Bank advances due through 2036 225 212
Long Term Debt (Textual) [Abstract]    
Long-term debt weighted average interest rate 3.75% 4.08%
Investment Fund Financing [Member]
   
Components of long-term debt    
Investment Fund Financing due through 2040 $ 28 $ 13
Long Term Debt (Textual) [Abstract]    
Long-term debt weighted average interest rate 2.30%