Segment And Geographic Information (Information Concerning Principal Geographic Areas) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	$ 1,030	$ 1,171	$ 2,056	$ 2,127
Income (loss) from continuing operations before income tax expense	140	167	77	170
Net income (loss)	(927)	(898)	166	(588)
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	47	59	87	110
Income (loss) from continuing operations before income tax expense	12	24	2	25
Net income (loss)	90	205	1,485	387
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	47	61	96	120
Income (loss) from continuing operations before income tax expense	14	17	28	31
Net income (loss)	13	79	1,243	162
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	(4)	(10)	(14)
Income (loss) from continuing operations before income tax expense	(1)	10	(19)	0
Net income (loss)	(146)	41	(86)	67
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	1	0	2
Income (loss) from continuing operations before income tax expense	(1)	(4)	(5)	(7)
Net income (loss)	194	62	274	108
Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	1	1	2
Income (loss) from continuing operations before income tax expense	0	1	(2)	1
Net income (loss)	29	23	54	50
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	983	1,112	1,969	2,017
Income (loss) from continuing operations before income tax expense	128	143	75	145
Net income (loss)	(1,017)	(1,103)	(1,319)	(975)
Amortization of Debt Discount (Premium)	$ 64	$ 100	$ 124	$ 211