Shareholders' Equity (Changes in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (1,641)	$ (881)
Other Comprehensive Income (Loss)	142	(325)
Reclassifications	1	2
Other Comprehensive Income (Loss)	143	(323)
Ending balance	(1,498)	(1,204)
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,602)	(813)
Other Comprehensive Income (Loss)	142	(345)
Reclassifications	0	0
Other Comprehensive Income (Loss)	142	(345)
Ending balance	(1,460)	(1,158)
Defined Benefit Pension [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(29)	(57)
Other Comprehensive Income (Loss)	0	20
Reclassifications	0	2
Other Comprehensive Income (Loss)	0	22
Ending balance	(29)	(35)
Deferred Loss on Derivatives [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(10)	(11)
Other Comprehensive Income (Loss)	0	0
Reclassifications	1	0
Other Comprehensive Income (Loss)	1	0
Ending balance	$ (9)	$ (11)