v3.2.0.727
Income Taxes (Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Contingency [Line Items]        
Income tax (expense) benefit $ (5) $ (15) $ (4) $ 4
Effective Income Tax Rate, Continuing Operations 21.00% 10.00% 31.00% (3.00%)
Unrecognized Tax Benefits $ 54   $ 54  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 13   13  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 11   11  
Unrecognized Tax Benefit Related to Deferred Tax Asset $ 41   $ 41