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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (90)	$ 46	$ (77)	$ 17
Other comprehensive income before reclassifications, net of tax	(20)	(44)	(38)	(15)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	(5)	(1)	(10)	(1)
Net Other Comprehensive Income	(15)	(43)	(28)	(14)
Ending Balance	(105)	3	(105)	3
Gains and Losses on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	0	(1)	(1)	(1)
Other comprehensive income before reclassifications, net of tax	0	0	0	0
Amounts reclassified from Accumulated other comprehensive loss, net of tax	0	(1)	(1)	(1)
Net Other Comprehensive Income	0	1	1	1
Ending Balance	0	0	0	0
Defined Benefit Pension Items [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(215)	(112)	(219)	(112)
Other comprehensive income before reclassifications, net of tax	(6)	0	(6)	0
Amounts reclassified from Accumulated other comprehensive loss, net of tax	(5)	0	(9)	0
Net Other Comprehensive Income	(1)	0	3	0
Ending Balance	(216)	(112)	(216)	(112)
Foreign Currency Translation Gains Losses [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	125	159	143	130
Other comprehensive income before reclassifications, net of tax	(14)	(44)	(32)	(15)
Amounts reclassified from Accumulated other comprehensive loss, net of tax	0	0	0	0
Net Other Comprehensive Income	(14)	(44)	(32)	(15)
Ending Balance	$ 111	$ 115	$ 111	$ 115