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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (105)	$ 3	$ (77)	$ 17
Other comprehensive income before reclassifications, net of tax	24	17	(14)	2
Amounts reclassified from Accumulated other comprehensive loss, net of tax	4	2	14	3
Net Other Comprehensive Income	28	19	0	5
Ending Balance	(77)	22	(77)	22
Gains and Losses on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	0	0	(1)	(1)
Other comprehensive income before reclassifications, net of tax	0	(1)	0	(1)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	0	1	1	2
Net Other Comprehensive Income	0	0	1	1
Ending Balance	0	0	0	0
Defined Benefit Pension Items [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(216)	(112)	(219)	(112)
Other comprehensive income before reclassifications, net of tax	0	0	(6)	0
Amounts reclassified from Accumulated other comprehensive loss, net of tax	4	1	13	1
Net Other Comprehensive Income	4	1	7	1
Ending Balance	(212)	(111)	(212)	(111)
Foreign Currency Translation Gains Losses [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	111	115	143	130
Other comprehensive income before reclassifications, net of tax	24	18	(8)	3
Amounts reclassified from Accumulated other comprehensive loss, net of tax	0	0	0	0
Net Other Comprehensive Income	24	18	(8)	3
Ending Balance	$ 135	$ 133	$ 135	$ 133