Segment And Geographic Information (Information Concerning Principal Geographic Areas) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	$ 1,142	$ 1,026
Income (loss) from continuing operations before income tax expense	292	(63)
Net income (loss)	227	1,093
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	33	40
Income (loss) from continuing operations before income tax expense	15	(10)
Net income (loss)	46	1,395
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	31	49
Income (loss) from continuing operations before income tax expense	13	14
Net income (loss)	10	1,230
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	2	(10)
Income (loss) from continuing operations before income tax expense	2	(18)
Net income (loss)	3	60
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	0
Income (loss) from continuing operations before income tax expense	0	(4)
Net income (loss)	0	80
Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	1
Income (loss) from continuing operations before income tax expense	0	(2)
Net income (loss)	33	25
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	1,109	986
Income (loss) from continuing operations before income tax expense	277	(53)
Net income (loss)	181	(302)
Amortization of Debt Discount (Premium)	$ 48	$ 60