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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2012
Intangible Assets [Abstract] |
Schedule of expected amortization expense | The estimated aggregate amortization expense for the years ending December 31, 2013 through December 31, 2017 is as follows (in millions):
| Amortization Expense
2013 | $ | 21 |
2014 | 21 |
2015 | 21 |
2016 | 18 |
2017 | 7 |

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- Definition Tabular disclosure of the estimated aggregate amortization expense for intangible assets subject to amortization for each of the five succeeding fiscal years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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