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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2011
Jun. 30, 2009
Senior Debentures 7.50%, due 2010
Jun. 30, 2009
Senior Notes 8.25%, due 2013
Jun. 30, 2009
Interest Rate Swaps
Fair Value Hedges
Senior Debentures 7.50%, due 2010
Jun. 30, 2009
Interest Rate Swaps
Fair Value Hedges
Senior Notes 8.25%, due 2013
Dec. 31, 2010
Interest Rate Swaps
Interest Expense
Fair Value Hedges
Dec. 31, 2009
Interest Rate Swaps
Interest Expense
Fair Value Hedges
Derivatives and Hedges              
Terminated interest rate swaps, notional amount $ 700            
Face Value   250 450        
Extinguishment of debt, carrying amount   222          
Proceeds from termination of interest rate swaps       5 12    
Interest rate swaps gain (loss) recognized             (11)
Related long-term debt gain (loss) recognized             11
Proceeds recognized and amortized for terminated interest rate swaps       4   10 7
Net impact on interest expense           $ 10 $ 7