Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (203)	$ 55	$ (147)	$ 36
Other comprehensive income before reclassifications	(57)	16
Amounts reclassified from accumulated other comprehensive income	1	3
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(168)	85	(111)	67
Other comprehensive income before reclassifications	(57)	18
Amounts reclassified from accumulated other comprehensive income	0	0
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(35)	(30)	$ (36)	$ (31)
Other comprehensive income before reclassifications	0	(2)
Amounts reclassified from accumulated other comprehensive income	$ 1	$ 3