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, 2014	Mar. 31, 2013
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (21)	$ (77)
Other comprehensive income before reclassifications, net of tax	3	(18)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	3	5
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		(4)
Net Other Comprehensive Income	6	(13)
Ending Balance	(15)	(90)
Gains and Losses on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance		(1)
Other comprehensive income before reclassifications, net of tax		0
Amounts reclassified from Accumulated other comprehensive loss, net of tax	0	1
Net Other Comprehensive Income		1
Ending Balance		0
Defined Benefit Pension Items [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(151)	(219)
Other comprehensive income before reclassifications, net of tax	0	0
Amounts reclassified from Accumulated other comprehensive loss, net of tax	3	4
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	3
Net Other Comprehensive Income	3	4
Ending Balance	(148)	(215)
Foreign Currency Translation Gains Losses [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	130	143
Other comprehensive income before reclassifications, net of tax	3	(18)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	0	0
Net Other Comprehensive Income	3	(18)
Ending Balance	$ 133	$ 125