Taxation (Reconciliation of Unrecognized Tax Benefits) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
---|---|---|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] | ||
Unrecognized Tax Benefits, beginning of year | $ 27 | $ 26 |
Additions based on tax provisions related to the current year | 2 | 5 |
Reductions for the lapse of the applicable statutes of limitations | (6) | (4) |
Unrecognized Tax Benefits, end of year | $ 23 | $ 27 |