Segment And Geographic Information (Information Concerning Principal Geographic Areas) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	$ 1,093	$ 1,142
Income (loss) from continuing operations before income tax expense	282	292
Net income (loss)	576	227
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	25	33
Income (loss) from continuing operations before income tax expense	15	15
Net income (loss)	471	46
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	24	31
Income (loss) from continuing operations before income tax expense	11	13
Net income (loss)	8	10
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	1	2
Income (loss) from continuing operations before income tax expense	4	2
Net income (loss)	11	3
Asia-Pacific [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	0
Net income (loss)	452	33
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	1,068	1,109
Income (loss) from continuing operations before income tax expense	267	277
Net income (loss)	105	181
Amortization of Debt Discount (Premium)	$ 14	$ 48