Accumulated Other Comprehensive Income (Loss) (AOCI) Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	$ (38)	$ (37)
Other comprehensive (loss) income before reclassifications	28	(15)
Amounts reclassified from AOCI	(4)	(10)
Accumulated other comprehensive income (loss), ending balance	(14)	(62)
Net current period other comprehensive (loss) income	24	(25)
Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	(52)	(6)
Other comprehensive (loss) income before reclassifications	30	(53)
Amounts reclassified from AOCI	0	0
Accumulated other comprehensive income (loss), ending balance	(22)	(59)
Net current period other comprehensive (loss) income	30	(53)
Changes in Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	16	(22)
Other comprehensive (loss) income before reclassifications	0	31
Amounts reclassified from AOCI	(6)	(12)
Accumulated other comprehensive income (loss), ending balance	10	(3)
Net current period other comprehensive (loss) income	(6)	19
Changes in Fair Value of Effective Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	(5)	(10)
Other comprehensive (loss) income before reclassifications	(2)	4
Amounts reclassified from AOCI	2	2
Accumulated other comprehensive income (loss), ending balance	(5)	(4)
Net current period other comprehensive (loss) income	0	6
Changes in Fair Value of Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning balance	3	1
Other comprehensive (loss) income before reclassifications	0	3
Amounts reclassified from AOCI	0	0
Accumulated other comprehensive income (loss), ending balance	3	4
Net current period other comprehensive (loss) income	$ 0	$ 3