Income Taxes Income Tax Expense (Details) (USD $) In Millions, unless otherwise specified	11 Months Ended	12 Months Ended		1 Months Ended
	Dec. 31, 2010 Successor [Member]	Dec. 31, 2012 Successor [Member]	Dec. 31, 2011 Successor [Member]	Feb. 12, 2010 Predecessor [Member]
Income Tax Contingency [Line Items]
Current Federal Tax Expense (Benefit)	$ 593	$ 1,204	$ 220	$ 23
Current State and Local Tax Expense (Benefit)	73	141	40	3
Current Income Tax Expense (Benefit)	666	1,345	260	26
Deferred Federal Income Tax Expense (Benefit)	626	591	1,375	113
Deferred State and Local Income Tax Expense (Benefit)	84	69	134	14
Deferred Income Tax Expense (Benefit)	710	660	1,509	127
Income Tax Expense (Benefit), Continuing Operations	$ 1,376	$ 2,005	$ 1,769	$ 153