Reclassification From Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2014	$ 62
Other comprehensive income (loss) before reclassifications	11
Amounts reclassified from other comprehensive loss	(25)
Net current-period other comprehensive loss	(14)
Ending balance, March 31, 2015	48
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2014	98
Other comprehensive income (loss) before reclassifications	17
Amounts reclassified from other comprehensive loss	(25)
Net current-period other comprehensive loss	(8)
Ending balance, March 31, 2015	90
Pension And Other Postretirement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2014	(24)
Other comprehensive income (loss) before reclassifications
Amounts reclassified from other comprehensive loss
Net current-period other comprehensive loss
Ending balance, March 31, 2015	(24)
Foreign Currency [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, December 31, 2014	(12)
Other comprehensive income (loss) before reclassifications	(6)
Net current-period other comprehensive loss	(6)
Ending balance, March 31, 2015	$ (18)