Pension and Other Postretirement Benefits - About our Plans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Employees	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Percent at which excess actuarial gains (losses) are amortized to other operating expense	10.00%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Covered retirees | Employees	21,700
Covered vested former employees | Employees	15,700
Covered active employees | Employees	14,800
Market-related valuation of pension plan assets	$ 3,900
Defined benefit plan cost	18	$ (1)	$ 7
Defined benefit plan benefit obligation	4,888	4,934	5,269
Plan assets at fair value	$ 3,977	3,981	4,170
Pension Benefits [Member] | Plan Assets Excluding Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Period for recognizing differences between actual and expected long-term returns to determine penison costs	5 years
Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan cost
Defined benefit plan benefit obligation
Plan assets at fair value
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Covered retirees | Employees	19,400
Covered active employees | Employees	19,900
Percentage of year 2009 per capita cost at which defined benefit plan cost is capped	200.00%
Defined benefit plan cost	$ 9	8	9
Defined benefit plan benefit obligation	277	295	335
Plan assets at fair value	5	$ 8	$ 12
Foreign Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan cost
Defined benefit plan benefit obligation
Plan assets at fair value