Segment And Geographic Information (Information Concerning Principal Geographic Areas) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	$ 1,108	$ 1,247	$ 3,164	$ 3,374
Income (loss) from continuing operations before income tax expense	205	297	282	467
Net income (loss)	91	384	257	(204)
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	42	47	129	157
Income (loss) from continuing operations before income tax expense	27	(12)	29	13
Net income (loss)	78	154	1,563	593
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	40	54	136	174
Income (loss) from continuing operations before income tax expense	14	1	42	32
Net income (loss)	13	62	1,256	227
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	2	(10)	(8)	(24)
Income (loss) from continuing operations before income tax expense	1	(11)	(18)	(11)
Net income (loss)	4	9	(82)	124
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	2	0	4
Income (loss) from continuing operations before income tax expense	12	(3)	7	(10)
Net income (loss)	26	62	300	171
Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	1	1	3
Income (loss) from continuing operations before income tax expense	0	1	(2)	2
Net income (loss)	35	21	89	71
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	1,066	1,200	3,035	3,217
Income (loss) from continuing operations before income tax expense	178	309	253	454
Net income (loss)	13	230	(1,306)	(797)
Amortization of Debt Discount (Premium)	$ 67	$ 79	$ 191	$ 291