v3.2.0.727
Other Income, Net Other Income (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
May. 17, 2011
Debt Instrument [Line Items]          
Loss on extinguishment of debt $ 0 $ 0 $ (52) $ (34)  
Gain on insurance recovery $ 0 $ 0 $ 0 $ 14  
Notes Payable, Other Payables | Senior Notes, 6.125% Due 2021          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 6.125%   6.125%   6.125%
Loss on extinguishment of debt     $ (52)