Commitments and Contingent Liabilities - Narrative (Details) € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2017 EUR (€) employee	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Environmental matters liability		$ 52	$ 55
Workers' compensation liability		252	248
Off-balance sheet financial guarantees written and other commitments		39	40
Workers' Compensation
Loss Contingencies [Line Items]
Potential workers' compensation liability in excess of recorded amount		30
Amiens Labor Claims
Loss Contingencies [Line Items]
Wrongful termination or other claims against company	€ 119	140
Amiens Labor Claims | Amiens Restructuring
Loss Contingencies [Line Items]
Loss contingency, number of plaintiffs | employee	850
Insurance Claims
Loss Contingencies [Line Items]
Guarantor obligations, maximum exposure		38		$ 46
Other Current Liabilities
Loss Contingencies [Line Items]
Environmental matters liability, current		18	21
Compensation and Benefits
Loss Contingencies [Line Items]
Workers' compensation liability, current		$ 46	$ 48