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Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |
Net cash for operating activities | $ 467 | $ 483 |  |
Net cash from financing activities | (518) | (860) |  |
Accounting Standards Update 2016-09, Statutory Tax Withholding Component |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Net cash for operating activities |  | 61 | $ 62 | $ 111
Net cash from financing activities |  | $ (61) | (62) | $ (111)
Accounting Standards Update 2017-07 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Non-operating income (expense), expected to be adjusted | $ 22 |  | $ 31 |

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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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