Assets and Liabilities of Businesses Held For Sale and Discontinued Operations (BAC Credomatic GECF Inc. Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financial Information For Discontinued Operations [Line Items]
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									$ (1,186)	$ (74)	$ (965)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	(305)	(111)	(553)	(217)	(240)	(64)	195	35	(1,186)	(74)	(965)
BAC [Member]
Financial Information For Discontinued Operations [Line Items]
Deconsolidation, gain or loss, amount											780
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent									$ 983	$ 854