Consolidated Statements of Changes in Equity (Deficit) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Changes in net unrealized losses on available-for-sale securities, net of tax	$ 389	$ 529	$ 702
Reclassification adjustment for losses (gains) included in net income, net of tax	123	157	241
Prior service cost and actuarial gains, net of amortization for defined benefit plans, net of tax	$ 20	$ 68
Preferred stock, shares outstanding	555,374,922	555,374,922