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Short-Term and Long-Term Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Short-Term Debt      
Commercial paper $ 0 $ 100,000,000  
Current maturities of long-term debt 300,000,000 250,000,000  
Other short-term debt 0 1,000,000  
Total short-term debt 300,000,000 351,000,000  
Weighted-average interest rate of commercial paper 0.20% 0.41%  
Long-Term Debt, Excluding Current Portion      
Unamortized premiums/discount (16,000,000) (19,000,000)  
Fair value hedge on interest rate swap 319,000,000 55,000,000  
Total unamortized premiums (discounts) and fair value hedge on interest rate swap agreements 303,000,000 36,000,000  
Total long-term debt 5,391,000,000 5,399,000,000  
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract]      
Gain (loss) on extinguishment of debt, pre-tax (8,000,000) (5,000,000) 64,000,000
Future principal payments due on long-term debt [Abstract]      
2012 300,000,000    
2013 200,000,000    
2014 500,000,000    
2015 250,000,000    
2016 0    
Thereafter 4,138,000,000    
Total 5,388,000,000    
Line of credit facility [Line Items]      
LOCs issued 2,040,000,000    
Commercial paper outstanding 0 100,000,000  
Current borrowing capacity 3,821,000,000    
Borrowing capacity available to reimburse the banks for drawn LOCs 1,000,000    
Minimum consolidated net worth 9,200,000,000    
Percentage of aggregate net proceeds of equity issuances 50.00%    
Debt to capital ratio (low end of range) 35.00%    
Debt to capital ratio (high end of range) 100.00%    
Certain debt covenants on capital securities [Abstract]      
Risk based capital ratio threshold 175.00%    
Four-year revolving credit facility [Member]
     
Line of credit facility [Line Items]      
Credit facility, Expiration Date Jun-2015    
LOCs issued 219,000,000    
Current borrowing capacity 2,000,000,000    
LOC facility due March 2023 [Member]
     
Line of credit facility [Line Items]      
Credit facility, Expiration Date Mar-2023    
Maximum Available 925,000,000    
LOCs issued 828,000,000    
Current borrowing capacity 828,000,000    
LOC facility due August 2031 [Member]
     
Line of credit facility [Line Items]      
Credit facility, Expiration Date Aug-2031    
Maximum Available 520,000,000    
LOCs issued 419,000,000    
Current borrowing capacity 419,000,000    
LOC facility due October 2031 [Member]
     
Line of credit facility [Line Items]      
Credit facility, Expiration Date Oct-2031    
Maximum Available 690,000,000    
LOCs issued 574,000,000    
Current borrowing capacity 574,000,000    
Junior subordinated debentures [Member]
     
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract]      
Principal balance outstanding prior to payoff   155,000,000  
Unamortized debt issuance costs and discounts prior to payoff   (5,000,000)  
Amount paid to retire   (155,000,000)  
Gain (loss) on extinguishment of debt, pre-tax   (5,000,000)  
Capital securities [Member]
     
Details underlying the recognition of gain or loss on extinguishment of debt [Abstract]      
Principal balance outstanding prior to payoff 275,000,000   87,000,000
Unamortized debt issuance costs and discounts prior to payoff (8,000,000)   (1,000,000)
Amount paid to retire (275,000,000)   (22,000,000)
Gain (loss) on extinguishment of debt, pre-tax (8,000,000)   64,000,000
Senior notes [Member]
     
Long-Term Debt, Excluding Current Portion      
Principal balance 3,875,000,000 3,875,000,000  
Senior notes [Member] | 5.65% notes, due 2012 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 5.65%    
Maturity date 2012    
Principal balance 0 300,000,000  
Senior notes [Member] | LIBOR plus 175 bps loan, due 2013 [Member]
     
Long-Term Debt, Excluding Current Portion      
Basis points over LIBOR 1.75%    
Maturity date 2013    
Principal balance 200,000,000 200,000,000  
Senior notes [Member] | 4.75% notes, due 2014 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 4.75%    
Maturity date 2014    
Principal balance 300,000,000 300,000,000  
Senior notes [Member] | 4.75% notes, due 2014 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 4.75%    
Maturity date 2014    
Principal balance 200,000,000 200,000,000  
Senior notes [Member] | 4.30% notes, due 2015 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 4.30%    
Maturity date 2015    
Principal balance 250,000,000 250,000,000  
Senior notes [Member] | LIBOR plus 3 bps notes, due 2017 [Member]
     
Long-Term Debt, Excluding Current Portion      
Basis points over LIBOR 0.03%    
Maturity date 2017    
Principal balance 250,000,000 250,000,000  
Senior notes [Member] | 7.00% notes, due 2018 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 7.00%    
Maturity date 2018    
Principal balance 200,000,000 200,000,000  
Senior notes [Member] | 8.75% notes, due 2019 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 8.75%    
Maturity date 2019    
Principal balance 500,000,000 500,000,000  
Senior notes [Member] | 6.25% notes, due 2020 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 6.25%    
Maturity date 2020    
Principal balance 300,000,000 300,000,000  
Senior notes [Member] | 4.85% notes, due 2021 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 4.85%    
Maturity date 2021    
Principal balance 300,000,000 0  
Senior notes [Member] | 6.15% notes, due 2036 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 6.15%    
Maturity date 2036    
Principal balance 500,000,000 500,000,000  
Senior notes [Member] | 6.30% notes, due 2037 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 6.30%    
Maturity date 2037    
Principal balance 375,000,000 375,000,000  
Senior notes [Member] | 7.00% notes, due 2040 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 7.00%    
Maturity date 2040    
Principal balance 500,000,000 500,000,000  
Capital securities [Member]
     
Long-Term Debt, Excluding Current Portion      
Principal balance 1,213,000,000 1,488,000,000  
Capital securities [Member] | 6.75%, due 2066 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 6.75%    
Maturity date 2066    
Principal balance 0 275,000,000  
Capital securities [Member] | 7.00%, due 2066 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 7.00%    
Maturity date 2066    
Principal balance 722,000,000 722,000,000  
Capital securities [Member] | 6.05%, due 2067 [Member]
     
Long-Term Debt, Excluding Current Portion      
Interest rate 6.05%    
Maturity date 2067    
Principal balance $ 491,000,000 $ 491,000,000