Segment And Geographic Information (Information Concerning Principal Geographic Areas) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	$ 1,231	$ 1,030	$ 2,373	$ 2,056
Income (loss) from continuing operations before income tax expense	347	140	639	77
Net income (loss)	323	(927)	550	166
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	33	47	66	87
Income (loss) from continuing operations before income tax expense	15	12	30	2
Net income (loss)	63	90	108	1,485
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	33	47	64	96
Income (loss) from continuing operations before income tax expense	16	14	29	28
Net income (loss)	36	13	46	1,243
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	0	2	(10)
Income (loss) from continuing operations before income tax expense	(1)	(1)	1	(19)
Net income (loss)	1	(146)	4	(86)
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	(1)	0	(5)
Net income (loss)	(7)	194	(8)	274
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)	33	29	66	54
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	1,198	983	2,307	1,969
Income (loss) from continuing operations before income tax expense	332	128	609	75
Net income (loss)	260	(1,017)	442	(1,319)
Amortization of Debt Discount (Premium)	$ 50	$ 64	$ 98	$ 124