Stockholders' Equity (Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Unrealized translation - Beginning balance	$ (1,335)		$ (525)
Cash flow hedge and other - Beginning balance	(16)		(34)
Other comprehensive income/(loss) before reclassifications	(465)		(2)
(Income)/loss reclassified from AOCI	0		0
Other comprehensive income/(loss) before reclassifications	37		(4)
Income/loss reclassified from AOCI	(17)		0
Unrealized currency translation adjustments	(468)		(7)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(8)		(14)
Unrealized translation - Ending balance	(1,812)		(527)
Cash flow hedge and other - Ending balance	4		(38)
Other	20		(4)
Pension Plan [Member]
Defined benefit and other postretirement benefit plans - Beginning balance	(1,924)		(1,668)
Other comprehensive income/(loss) before reclassifications	(8)		(2)
(Income)/loss reclassified from AOCI	14	[1]	16	[1]
Defined benefit and other postretirement benefit plans - Ending balance	(1,918)		(1,654)
Accumulated Other Comprehensive Income (Loss), Decrease from Purchase of Noncontrolling Interest	0
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined benefit and other postretirement benefit plans - Beginning balance	(37)		(15)
Other comprehensive income/(loss) before reclassifications	2		0
(Income)/loss reclassified from AOCI	0	[1]	0	[1]
Defined benefit and other postretirement benefit plans - Ending balance	(35)		(15)
Accumulated Other Comprehensive Income (Loss), Decrease from Purchase of Noncontrolling Interest	0
Parent [Member]
Unrealized currency translation adjustments	(465)		(2)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(8)
Other	20		(4)
Parent [Member] | Pension Plan [Member]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(6)		(14)
Parent [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(2)		0
Unrealized Translation [Member]
Accumulated Other Comprehensive Income (Loss), Decrease from Purchase of Noncontrolling Interest	12
Cash Flow Hedges and Other [Member]
Accumulated Other Comprehensive Income (Loss), Decrease from Purchase of Noncontrolling Interest	$ 0

[1] (a)Included in computation of net periodic pension and postretirement benefits costs (see Note 4).