Segment And Geographic Information (Information Concerning Principal Geographic Areas) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	$ 1,026	$ 956
Income (loss) from continuing operations before income tax expense	(63)	3
Net income (loss)	1,093	310
Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	40	51
Income (loss) from continuing operations before income tax expense	(10)	1
Net income (loss)	1,395	182
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	49	59
Income (loss) from continuing operations before income tax expense	14	14
Net income (loss)	1,230	83
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	(10)	(10)
Income (loss) from continuing operations before income tax expense	(18)	(10)
Net income (loss)	60	26
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	0	1
Income (loss) from continuing operations before income tax expense	(4)	(3)
Net income (loss)	80	46
Asia-Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	1	1
Income (loss) from continuing operations before income tax expense	(2)	0
Net income (loss)	25	27
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue (loss)	986	905
Income (loss) from continuing operations before income tax expense	(53)	2
Net income (loss)	(302)	128
Amortization of Debt Discount (Premium)	$ 60	$ 111