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) | ||||