Income Taxes	9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 3 — INCOME TAXES Our liability for unrecognized tax benefits was $429 million, including accrued interest of $40 million, as of September 30, 2017 ($418 million and $45 million, respectively, as of December 31, 2016). Unrecognized tax benefits of $136 million ($137 million as of December 31, 2016) would affect the effective rate, if recognized. Our provision for income taxes for the quarters ended September 30, 2017 and 2016, included tax benefits of $4 million and $11 million, respectively, and for the nine months ended September 30, 2017 and 2016, included tax benefits of $80 million and $129 million, respectively, related to the settlement of employee equity awards. Our provision for income taxes for the quarter and nine months ended September 30, 2017 also included $4 million and $16 million, respectively, of reductions in interest expense (net of tax). We also reduced our provision for income taxes for the quarter and nine months ended September 30, 2016 by $51 million, including interest of $17 million (net of tax) primarily related to the completion of IRS examinations which resolved all outstanding federal tax issues for our 2011 and 2012 tax years. We are subject to examination by federal, state and foreign taxing authorities. Depending on the resolution of any federal, state and foreign tax disputes, the completion of examinations by federal, state or foreign taxing authorities, or the expiration of statutes of limitation for specific taxing jurisdictions, we believe it is reasonably possible that our liability for unrecognized tax benefits may significantly increase or decrease within the next 12 months. However, we are currently unable to estimate the range of any possible change.

NOTE 3 — INCOME TAXES

Our liability for unrecognized tax benefits was $429 million, including accrued interest of $40 million, as of September 30, 2017 ($418 million and $45 million, respectively, as of December 31, 2016). Unrecognized tax benefits of $136 million ($137 million as of December 31, 2016) would affect the effective rate, if recognized.

Our provision for income taxes for the quarters ended September 30, 2017 and 2016, included tax benefits of $4 million and $11 million, respectively, and for the nine months ended September 30, 2017 and 2016, included tax benefits of $80 million and $129 million, respectively, related to the settlement of employee equity awards. Our provision for income taxes for the quarter and nine months ended September 30, 2017 also included $4 million and $16 million, respectively, of reductions in interest expense (net of tax). We also reduced our provision for income taxes for the quarter and nine months ended September 30, 2016 by $51 million, including interest of $17 million (net of tax) primarily related to the completion of IRS examinations which resolved all outstanding federal tax issues for our 2011 and 2012 tax years.

We are subject to examination by federal, state and foreign taxing authorities. Depending on the resolution of any federal, state and foreign tax disputes, the completion of examinations by federal, state or foreign taxing authorities, or the expiration of statutes of limitation for specific taxing jurisdictions, we believe it is reasonably possible that our liability for unrecognized tax benefits may significantly increase or decrease within the next 12 months. However, we are currently unable to estimate the range of any possible change.