Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance	$ 458	$ 591	$ 279	$ 771
Other comprehensive income (loss) attributable to the Company	(59)	(243)	(83)	(434)
Balance	515	374	515	374
Net Effect of Exchange Rate Fluctuations
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance	(574)	(281)	(568)	(55)
Change before reclassifications	(77)	(257)	(83)	(483)
Other comprehensive income (loss) attributable to the Company	(77)	(257)	(83)	(483)
Balance	(651)	(538)	(651)	(538)
Change in Certain Derivative Instruments
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance	(11)	(13)	(17)	(11)
Amounts reclassified from accumulated other comprehensive income	(1)	(2)	4	(4)
Tax effect		(1)	1	(1)
Other comprehensive income (loss) attributable to the Company	(1)	(3)	5	(5)
Balance	(12)	(16)	(12)	(16)
Employee Benefit Plans
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance	(1,448)	(1,383)	(1,432)	(1,428)
Amounts reclassified from accumulated other comprehensive income	26	20	(2)	58
Translation effect	(5)	4	6	10
Tax effect		1	1	2
Other comprehensive income (loss) attributable to the Company	21	25	5	70
Balance	(1,427)	(1,358)	(1,427)	(1,358)
Accumulated Other Comprehensive Loss
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance	(2,033)	(1,677)	(2,017)	(1,494)
Change before reclassifications	(77)	(257)	(83)	(483)
Amounts reclassified from accumulated other comprehensive income	25	18	2	54
Translation effect	(5)	4	6	10
Tax effect			2	1
Other comprehensive income (loss) attributable to the Company	(57)	(235)	(73)	(418)
Balance	$ (2,090)	$ (1,912)	$ (2,090)	$ (1,912)