Income Taxes	9 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense was $10 million for the three months ended September 30, 2016, compared to $70 million for the same period in 2015. Income tax expense was $160 million for the nine months ended September 30, 2016, compared to $164 million for the same period in 2015. The lower tax expense for the three-month period was primarily due to the sale of Empress on August 4, 2016 and the release of tax reserves. The nine-month periods include the $74 million tax impact of the loss on investment due to the impairment of goodwill at DCP Midstream in 2015, partially offset by tax rate changes in 2016. The effective income tax rate was 3% for the three months ended September 30, 2016, compared to 22% for the same period in 2015. The effective income tax rate was 16% for the nine months ended September 30, 2016, compared to 20% for the same period in 2015. The lower effective income tax rate for the three-month period was primarily due to the sale of Empress on August 4, 2016 and the release of tax reserves. The nine-month periods include the $74 million tax impact of the loss on investment due to the impairment of goodwill at DCP Midstream in 2015, partially offset by tax rate changes in 2016. There was an $8 million decrease in unrecognized tax benefits recorded during the nine months ended September 30, 2016. Although uncertain, we believe it is reasonably possible that the total amount of unrecognized tax benefits could decrease by approximately $20 million to $25 million prior to September 30, 2017 due to audit settlements and statute of limitations expirations.

Income Taxes

9 Months Ended

Sep. 30, 2016

Income tax expense was $10 million for the three months ended September 30, 2016, compared to $70 million for the same period in 2015. Income tax expense was $160 million for the nine months ended September 30, 2016, compared to $164 million for the same period in 2015. The lower tax expense for the three-month period was primarily due to the sale of Empress on August 4, 2016 and the release of tax reserves. The nine-month periods include the $74 million tax impact of the loss on investment due to the impairment of goodwill at DCP Midstream in 2015, partially offset by tax rate changes in 2016.

The effective income tax rate was 3% for the three months ended September 30, 2016, compared to 22% for the same period in 2015. The effective income tax rate was 16% for the nine months ended September 30, 2016, compared to 20% for the same period in 2015. The lower effective income tax rate for the three-month period was primarily due to the sale of Empress on August 4, 2016 and the release of tax reserves. The nine-month periods include the $74 million tax impact of the loss on investment due to the impairment of goodwill at DCP Midstream in 2015, partially offset by tax rate changes in 2016.

There was an $8 million decrease in unrecognized tax benefits recorded during the nine months ended September 30, 2016. Although uncertain, we believe it is reasonably possible that the total amount of unrecognized tax benefits could decrease by approximately $20 million to $25 million prior to September 30, 2017 due to audit settlements and statute of limitations expirations.