Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	$ (2,076)	$ (2,643)	$ (2,356)	$ (2,702)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	262	49
Other Comprehensive Income (Loss), Before Reclassifications, Tax	(2)	7
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	20	3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	280	59
Translation Adjustments Other Than Translation Of Balance Sheet Tax Benefit Expense	(34)	(17)
Pension and other postretirement benefit adjustments, tax cost	(11)	20
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(6)	(4)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	(1,526)	(1,284)	(1,798)	(1,332)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	262	49
Other Comprehensive Income (Loss), Before Reclassifications, Tax	10	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	272	48
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	(550)	(1,360)	(571)	(1,379)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax		0
Other Comprehensive Income (Loss), Before Reclassifications, Tax	0	6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	21	13
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	21	19
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive loss	0	1	$ 13	$ 9
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax		0
Other Comprehensive Income (Loss), Before Reclassifications, Tax	(12)	2
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(1)	(10)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (13)	$ (8)