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Derivative Instruments (Details) (USD $)
In Millions
3 Months Ended9 Months Ended3 Months Ended
Sep. 30, 2011
Jun. 30, 2009
Senior Notes 8.25%, due 2013
Interest Rate Swaps
Fair Value Hedges
Sep. 30, 2011
Interest Rate Swaps
Interest Expense
Jun. 30, 2009
Interest Rate Swaps
Fair Value Hedges
Senior Debentures 7.50%, due 2010
Jun. 30, 2009
Senior Debentures 7.50%, due 2010
Jun. 30, 2009
Senior Notes 8.25%, due 2013
Derivatives and Hedges      
Terminated interest rate swaps notional amount$ 700     
Face Value    250450
Extinguishment of Debt Carrying Amount    222 
Proceeds from termination of interest rate swaps 12 5  
Derivative proceeds recognized as reduction to interest expense upon termination of interest rate swap agreements   4  
Reduction in interest expense due to amortization of proceeds from terminated interest rate swaps  $ 11