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Stock-Based Compensation	9 Months Ended
Stock-Based Compensation	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Upon change in control on January 6, 2015, all unvested stock awards including restricted stock units ("RSU's"), Long Term Incentive Plan ("LTIP") awards and performance restricted stock units ("PRSU's") for performance periods ending after 2014 vested, where applicable, and became payable according to change in control provisions of the stock plans or other applicable agreements. The change-in-control vesting resulted in a total payout of $37 million during the quarter ended March 31, 2015. There has been no additional stock compensation expense in 2015 and stock-based compensation expense totaled $4 million for the quarter ended September 30, 2014. Stock-based compensation expense for the nine months ended September 30, 2015 and 2014 totaled $16 million and $8 million, respectively. The stock plan was terminated in August 2015. See Note 2 for further details regarding the change in control.