|
Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended |
|---|---|
|
Mar. 31, 2015
|
|
| Income Tax Disclosure [Abstract] | |
| Change in income tax expense | $ (69) |
| Change in effective income tax rate | (2.80%) |
| Period within which resolution of tax appeal is reasonably possible (in months) | 12 months |
| Minimum reasonably possible reduction in the amount of unrecognized tax benefits | 100 |
| Maximum reasonably possible reduction in the amount of unrecognized tax benefits | $ 350 |