|
Income Taxes Level 4 (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Valuation Allowance [Line Items] | ||||
| Deferred Tax Assets, Valuation Allowance | $ 588 | $ 518 | $ 122 | $ 432 |
| Income tax benefit | $ (26) | $ (349) | $ 384 | |