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Debt and Other Obligations Putable Automatic Rate Reset Securities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
PARRS 1998 Series D Bond
Jun. 01, 2012
PARRS 1998 Series D Bond
Mar. 31, 2012
PARRS 1998 Series D Bond
Jun. 30, 2012
PARRS 1999 Series A Bond
May 01, 2012
PARRS 1999 Series A Bond
Mar. 31, 2012
PARRS 1999 Series A Bond
Debt Instrument            
PARRS interest rate prior to rate reset   4.73%     4.50%  
PARRS interest rate after rate reset   4.06%     4.15%  
Reclass from long-term to current maturities     $ 330     $ 274
Repurchased face amount   5     2  
Amount outstanding classified as long-term debt $ 325     $ 272