Changes in Accumulated Other Comprehensive Income Level 4 (Details) - Summary of Changes in Accumulated Other Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Beginning Balance	$ (77)	$ 17
Other comprehensive income before reclassifications, net of tax	(18)	28
Amounts reclassified from Accumulated other comprehensive loss, net of tax	5	1
Net Other Comprehensive Income	(13)	29
Ending Balance	(90)	46
Gains and Losses on Cash Flow Hedges [Member]
Beginning Balance	(1)	(1)
Other comprehensive income before reclassifications, net of tax	0	(1)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	1	1
Net Other Comprehensive Income	1	0
Ending Balance	0	(1)
Defined Benefit Pension Items [Member]
Beginning Balance	(219)	(112)
Other comprehensive income before reclassifications, net of tax	0	0
Amounts reclassified from Accumulated other comprehensive loss, net of tax	4	0
Net Other Comprehensive Income	4	0
Ending Balance	(215)	(112)
Foreign Currency Translation Gains Losses [Member]
Beginning Balance	143	130
Other comprehensive income before reclassifications, net of tax	(18)	29
Amounts reclassified from Accumulated other comprehensive loss, net of tax	0	0
Net Other Comprehensive Income	(18)	29
Ending Balance	$ 125	$ 159