Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Loss
Balance at the beginning of the period			$ (782)	$ (583)
Losses on cash-flow hedges, net of income tax effect of $8 and $21	$ (15)	$ (48)	(18)	(47)
Amount of losses on cash-flow hedges reclassified to earnings, net of income tax effect of $10 and $11	7	11	23	24
Actuarial gains on pension and postretirement obligations, settlements and plan amendments, net of income tax effect of $2			6
Losses related to pension and other postretirement obligations reclassified to earnings, net of income tax effect		1	1	3
Currency translation adjustment	(157)	(121)	(283)	(116)
Balance at end of the period	(1,053)	(719)	(1,053)	(719)
Income tax effect of accumulated other comprehensive gain (loss)
Losses on cash-flow hedges, income tax effect	(7)	(23)	(8)	(21)
Amount of losses on cash flow hedges reclassified to earnings, income tax effect	(3)	(5)	(10)	(11)
Actuarial gains on pension and postretirement obligations, settlements and plan amendments, income tax effect			2
Cumulated Translation Adjustment
Accumulated Other Comprehensive Loss
Balance at the beginning of the period			(701)	(489)
Currency translation adjustment			(283)	(116)
Balance at end of the period	(984)	(605)	(984)	(605)
Deferred Gain/(Loss) on Hedging Activities
Accumulated Other Comprehensive Loss
Balance at the beginning of the period			(19)	(40)
Losses on cash-flow hedges, net of income tax effect of $8 and $21			(18)	(47)
Amount of losses on cash-flow hedges reclassified to earnings, net of income tax effect of $10 and $11			23	24
Balance at end of the period	(14)	(63)	(14)	(63)
Income tax effect of accumulated other comprehensive gain (loss)
Losses on cash-flow hedges, income tax effect			(8)	(21)
Amount of losses on cash flow hedges reclassified to earnings, income tax effect			(10)	(11)
Pension/Postretirement Adjustment
Accumulated Other Comprehensive Loss
Balance at the beginning of the period			(61)	(53)
Actuarial gains on pension and postretirement obligations, settlements and plan amendments, net of income tax effect of $2			6
Losses related to pension and other postretirement obligations reclassified to earnings, net of income tax effect			1	3
Balance at end of the period	(54)	(50)	(54)	(50)
Income tax effect of accumulated other comprehensive gain (loss)
Actuarial gains on pension and postretirement obligations, settlements and plan amendments, income tax effect			2
Unrealized Loss On Investment
Accumulated Other Comprehensive Loss
Balance at the beginning of the period			(1)	(1)
Balance at end of the period	$ (1)	$ (1)	$ (1)	$ (1)