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Long-term and Short-term Debt (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Debt Instrument [Line Items]    
Long-term Debt $ 23,692 $ 27,586
Capital lease obligations 37 32
Long-term debt 20,624 20,766
Short-term debt 686 306
Total 21,310 21,072
Senior Notes [Member]
   
Debt Instrument [Line Items]    
Interest Rate Range Minimum 0.57%  
Interest Rate Range Maximum 7.72%  
Weighted Average Interest Rate 4.84%  
Debt Instrument, Maturity Date Range, Start 2012  
Debt Instrument, Maturity Date Range, End 2045  
Long-term Debt 15,666 16,258
Debt Advances Agreements [Member]
   
Debt Instrument [Line Items]    
Interest Rate Range Minimum 0.23%  
Interest Rate Range Maximum 4.86%  
Weighted Average Interest Rate 2.28%  
Debt Instrument, Maturity Date Range, Start 2012  
Debt Instrument, Maturity Date Range, End 2021  
Long-term Debt 4,179 3,600
Surplus Notes [Member]
   
Debt Instrument [Line Items]    
Interest Rate Range Minimum 7.63%  
Interest Rate Range Maximum 7.88%  
Weighted Average Interest Rate 7.85%  
Debt Instrument, Maturity Date Range, Start 2015  
Debt Instrument, Maturity Date Range, End 2025  
Long-term Debt 700 699
Fixed Rate Notes [Member]
   
Debt Instrument [Line Items]    
Interest Rate Range Minimum 7.50%  
Interest Rate Range Maximum 15.00%  
Weighted Average Interest Rate 10.02%  
Debt Instrument, Maturity Date Range, Start 2012  
Debt Instrument, Maturity Date Range, End 2012  
Long-term Debt 0 82
Other Notes with Varying Interest Rates [Member]
   
Debt Instrument [Line Items]    
Interest Rate Range Minimum 2.77%  
Interest Rate Range Maximum 8.00%  
Weighted Average Interest Rate 5.23%  
Debt Instrument, Maturity Date Range, Start 2016  
Debt Instrument, Maturity Date Range, End 2030  
Long-term Debt $ 42 $ 95