Income Taxes (Computation Of Income Tax Expense (Benefit)) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Line Items]
Statutory income tax provision benefit		$ (763)	$ (857)	$ (691)
State income tax expense (benefit), net of federal tax effect		(8)	(32)	(37)
Book expenses not deductible for tax purposes		27	19	9
Bankruptcy administration expenses		83	26	0
Interest cutback to net operating loss (NOL)		141	0	0
Alternative minimum tax credit refund		(22)	0	0
Change in valuation allowance	214	717	839	705
Tax benefit resulting from OCI allocation		(538)	(569)	0
Other, net		17	5	14
Income tax benefit		(346)	(569)	0
AA [Member]
Income Tax Disclosure [Line Items]
Statutory income tax provision benefit		(658)	(873)	(686)
State income tax expense (benefit), net of federal tax effect		(14)	(35)	(32)
Book expenses not deductible for tax purposes		20	20	7
Bankruptcy administration expenses		82	26	0
Interest cutback to net operating loss (NOL)		53	0	0
Alternative minimum tax credit refund		(30)	0	0
Change in valuation allowance	214	714	858	697
Tax benefit resulting from OCI allocation		(538)	(569)	0
Other, net		17	4	14
Income tax benefit		$ (354)	$ (569)	$ 0