Segment And Geographic Information (Information Concerning Principal Geographic Areas) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	$ 1,264	$ 1,108	$ 3,637	$ 3,164
Income (loss) from continuing operations before income tax expense	420	205	1,059	282
Net income (loss)	423	91	973	257
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	31	42	97	129
Income (loss) from continuing operations before income tax expense	6	27	36	29
Net income (loss)	39	78	147	1,563
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	31	40	95	136
Income (loss) from continuing operations before income tax expense	7	14	36	42
Net income (loss)	9	13	55	1,256
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	2	2	(8)
Income (loss) from continuing operations before income tax expense	(1)	1	0	(18)
Net income (loss)	1	4	5	(82)
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	0	0	0
Income (loss) from continuing operations before income tax expense	0	12	0	7
Net income (loss)	0	26	(8)	300
Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	0	0	1
Income (loss) from continuing operations before income tax expense	0	0	0	(2)
Net income (loss)	29	35	95	89
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	1,233	1,066	3,540	3,035
Income (loss) from continuing operations before income tax expense	414	178	1,023	253
Net income (loss)	384	13	826	(1,306)
Amortization of Debt Discount (Premium)	$ 51	$ 67	$ 149	$ 191