Equity (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated other comprehensive income (loss), net of tax
Currency Translation Adjustments, Beginning balance	$ (8)	$ 73	$ 108
Unrealized Gain (Loss) on Available for Sale Securities, Beginning balance	2	2	2
Unrealized Gain (Loss) on Cash Flow Hedges, Beginning balance		(9)	(18)
Unrealized Actuarial Gain (Loss) on Defined Benefit Plans, Beginning balance	(170)	(69)	(47)
Unrealized Gain (Loss) on Equity Investments, Beginning balance		(6)	(15)
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(176)	(9)	30
Currency Translation Adjustments, Activity	3	(81)	(35)
Unrealized (loss) gain on equity investment, net of tax of $0	(3)	6	9
Unrealized Gain (Loss) on Cash Flow Hedges, Activity		9	9
Unrealized actuarial loss on defined benefit plans, net of tax	(13)	(101)	(22)
Unrealized Gain (Loss) on Equity Investments, Activity	(3)	6	9
Accumulated Other Comprehensive Income (Loss), net of tax	(13)	(167)	(39)
Currency Translation Adjustments, Ending balance	(5)	(8)	73
Unrealized Gain (Loss) on Available for Sale Securities, Ending balance	2	2	2
Unrealized Gain (Loss) on Cash Flow Hedges, Ending balance			(9)
Unrealized Actuarial Gain (Loss) on Defined Benefit Plans, Ending balance	(183)	(170)	(69)
Unrealized Gain (Loss) on Equity Investments, Ending balance	(3)		(6)
Accumulated Other Comprehensive Income (Loss), Ending balance	$ (189)	$ (176)	$ (9)