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Shareholders' Equity - Textuals (Details) (USD $)
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1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||
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Sep. 30, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
Series T Preferred Stock [Member]
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Dec. 31, 2012
Series L Preferred Stock [Member]
Days
D
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Dec. 31, 2011
Series L Preferred Stock [Member]
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Sep. 30, 2011
Berkshire Hathaway Warrant Six Percent Perpetual Preferred Series T Stock [Member]
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Sep. 02, 2011
Berkshire Hathaway Warrant Six Percent Perpetual Preferred Series T Stock [Member]
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Dec. 31, 2012
Warrants Expiring October 28, 2018 [Member]
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Dec. 31, 2012
Warrants Expiring January 16, 2019 [Member]
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Dec. 31, 2012
Stock Options [Member]
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Dec. 31, 2012
Bank of America Corporation [Member]
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Dec. 31, 2011
Bank of America Corporation [Member]
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Dec. 31, 2010
Bank of America Corporation [Member]
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Dec. 31, 2012
Retained Earnings [Member]
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Dec. 31, 2011
Retained Earnings [Member]
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Dec. 31, 2010
Retained Earnings [Member]
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Sep. 30, 2011
Common Stock Including Additional Paid in Capital [Member]
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Dec. 31, 2012
Common Stock Including Additional Paid in Capital [Member]
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Dec. 31, 2011
Common Stock Including Additional Paid in Capital [Member]
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Dec. 31, 2010
Common Stock Including Additional Paid in Capital [Member]
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Sep. 30, 2011
Preferred Stock [Member]
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Dec. 31, 2011
Exchange Agreements [Member]
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Sep. 30, 2012
Exchange Agreements [Member]
Common Stock [Member]
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Dec. 31, 2011
Exchange Agreements [Member]
Common Stock [Member]
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Sep. 30, 2012
Exchange Agreements [Member]
Non-Convertible Preferred Stock and Trust Preferred Securities [Member]
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Dec. 31, 2011
Exchange Agreement Non-Convertible Preferred Stock for Common Stock [Member]
Non-Convertible Preferred Stock [Member]
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Mar. 31, 2012
Exchange Agreement Non-Convertible Preferred Stock for Common Stock [Member]
Non-Convertible Preferred Stock [Member]
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Dec. 31, 2011
Exchange Agreement Non-Convertible Preferred Stock for Common Stock [Member]
Common Stock [Member]
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Mar. 31, 2012
Exchange Agreement Trust Preferred Securities for Common Stock [Member]
Trust Preferred Securities [Member]
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Dec. 31, 2011
Exchange Agreement Series L Perpetual Convertible Preferred Stock [Member]
Common Stock [Member]
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| Class of Stock [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Issuance of common stock, shares | 269,000,000 | 1,286,000,000 | 50,000,000 | 400,000,000 | 815,000,000 | |||||||||||||||||||||||||||||||||||||
| Warrant Exercised, Number of Shares | 50,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 700,000,000 | 121,800,000 | 150,400,000 | |||||||||||||||||||||||||||||||||||||||
| Class of Warrant or Right, Exercise Price of Warrants or Rights | 30.79 | 13.30 | ||||||||||||||||||||||||||||||||||||||||
| Proceeds from Warrant Exercises | $ 5,000,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Stock Issued During Period Value Preferred New Issues | 2,100,000,000 | 2,900,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Investment Warrants, Exercise Price | $ 7.142857 | |||||||||||||||||||||||||||||||||||||||||
| Stock issued in acquisition, shares | 50,354,000 | |||||||||||||||||||||||||||||||||||||||||
| Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | 297,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Shares Paid for Tax Withholding for Share Based Compensation | 104,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Number of Shares Authorized | 1,900,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Preferred stock dividends and accretion | 1,428,000,000 | 1,361,000,000 | 1,357,000,000 | |||||||||||||||||||||||||||||||||||||||
| Preferred | 1,472,000,000 | 1,325,000,000 | 1,357,000,000 | 1,472,000,000 | 1,325,000,000 | 1,357,000,000 | ||||||||||||||||||||||||||||||||||||
| Issuance of common stock | 19,244,000,000 | 412,000,000 | 2,200,000,000 | |||||||||||||||||||||||||||||||||||||||
| Payments Included in Exchange of Preferred Stock and Trust Preferred Securities for Common Stock | 398,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Proceeds from Issuance of Senior Long-term Debt | 2,300,000,000 | 231,000,000 | 129,000,000 | |||||||||||||||||||||||||||||||||||||||
| Carrying Value | 19,067,000,000 | [1] | 2,918,000,000 | [1] | 3,080,000,000 | [1] | 814,000,000 | 296,000,000 | ||||||||||||||||||||||||||||||||||
| Trust Preferred Securities, Carrying Amount | 760,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Stock Issued During Period, Common Stock in Exchange for Preferred Stock | 72,000,000 | 20,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Stock Issued During Period, Common Stock in Exchange for Preferred Stock, Value | 399,000,000 | 123,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Per Annum Dividend Rate | 6.00% | 7.25% | 7.25% | |||||||||||||||||||||||||||||||||||||||
| Non Cash Reduction to Preferred Stock Dividends | 184,000,000 | 17,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Other income (loss) | (1,839,000,000) | 6,869,000,000 | 2,384,000,000 | (304,000,000) | [2] | 10,603,000,000 | [2] | 2,781,000,000 | [2] | 202,000,000 | ||||||||||||||||||||||||||||||||
| Proceeds from Issuance of Preferred Stock and Preference Stock | 633,000,000 | 667,000,000 | 5,000,000,000 | 0 | ||||||||||||||||||||||||||||||||||||||
| Fair Value of Consideration Transferred in Exchange of Preferred Stock for Common Stock | 220,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Fair Value of Securities Issuable | 32,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Liquidation Preference Per Share | $ 100,000 | $ 1,000 | ||||||||||||||||||||||||||||||||||||||||
| Preferred Stock Dividend Rate Percentage Option To Exercise In Cash or Noncash Warrant Transaction | 6.00% | |||||||||||||||||||||||||||||||||||||||||
| Preferred Stock, Redemption Price Per Share | $ 105,000 | |||||||||||||||||||||||||||||||||||||||||
| Preferred Stock, Dividend Rate, Percentage Unpaid | 8.00% | |||||||||||||||||||||||||||||||||||||||||
| Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate | 35.00% | 35.00% | 35.00% | |||||||||||||||||||||||||||||||||||||||
| Increase In Retained Earnings And Net Income Applicable To Common Shareholders | 246,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Dividends, Preferred Stock, Stock | 36,000,000 | (44,000,000) | ||||||||||||||||||||||||||||||||||||||||
| Preferred Stock To Be Convertible Into Common Shares | 20 | |||||||||||||||||||||||||||||||||||||||||
| Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 | ||||||||||||||||||||||||||||||||||||||||
| Trading Days | 20 | |||||||||||||||||||||||||||||||||||||||||
| Consecutive Trading Days | 30 | |||||||||||||||||||||||||||||||||||||||||
| Common Stock Closing Price Exceeds Then Applicable Conversion Price Of Preferred Stock | 1.30 | |||||||||||||||||||||||||||||||||||||||||
| Increase to Tier 1 Capital, Percent | 0.29% | |||||||||||||||||||||||||||||||||||||||||
| Common stock issued under employee plans and related tax effects | $ 1,109,000,000 | $ 882,000,000 | $ 1,488,000,000 | $ 1,109,000,000 | $ 880,000,000 | $ 1,385,000,000 | ||||||||||||||||||||||||||||||||||||
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