Condensed Consolidating Financial Information of Guarantor Subsidiaries CONDENSED CONSOLIDATING CASH FLOW INFORMATION (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 1,466	$ 1,115
Net cash used in investing activities	(1,906)	(1,208)
Net cash provided by (used in) financing activities	441	116
Effect of foreign exchange rates	(8)	(4)
Net (decrease) increase in cash and cash equivalents	(7)	19
Cash and cash equivalents at beginning of period	175	106
Cash and cash equivalents at end of period	168	125
Parent
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	11	21
Net cash used in investing activities	(11)	(21)
Net cash provided by (used in) financing activities	0	0
Effect of foreign exchange rates	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
URNA
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	1,369	948
Net cash used in investing activities	(1,696)	(1,065)
Net cash provided by (used in) financing activities	349	113
Effect of foreign exchange rates	0	0
Net (decrease) increase in cash and cash equivalents	22	(4)
Cash and cash equivalents at beginning of period	17	20
Cash and cash equivalents at end of period	39	16
Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	3	3
Net cash used in investing activities	0	0
Net cash provided by (used in) financing activities	(3)	(3)
Effect of foreign exchange rates	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Non Guarantor Subsidiaries - Foreign
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	180	150
Net cash used in investing activities	(199)	(122)
Net cash provided by (used in) financing activities	(2)	(1)
Effect of foreign exchange rates	(8)	(4)
Net (decrease) increase in cash and cash equivalents	(29)	23
Cash and cash equivalents at beginning of period	158	86
Cash and cash equivalents at end of period	129	109
Non Guarantor Subsidiaries - SPV
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(97)	(7)
Net cash used in investing activities	0	0
Net cash provided by (used in) financing activities	97	7
Effect of foreign exchange rates	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	0	0
Net cash used in investing activities	0	0
Net cash provided by (used in) financing activities	0	0
Effect of foreign exchange rates	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0