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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, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Series T Preferred Stock [Member]
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Dec. 31, 2011
Series T Preferred Stock [Member]
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Dec. 31, 2013
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, 2013
Warrant One [Member]
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Dec. 31, 2013
Warrant Two [Member]
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Dec. 31, 2013
Employee Stock Option [Member]
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Sep. 30, 2011
Common Stock Including Additional Paid in Capital [Member]
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Dec. 31, 2013
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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Sep. 30, 2011
Preferred Stock
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Dec. 31, 2013
Preferred Stock
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Dec. 31, 2012
Preferred Stock
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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, 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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Dec. 31, 2013
Minimum [Member]
Preferred Stock, Excluding Series T Preferred [Member]
semi_annual_period
quarterly_period
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| Class of Stock [Line Items] | ||||||||||||||||||||||||||||||||||||
| Stock Issued During Period, Shares, New Issues | 269,000,000 | 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 | |||||||||||||||||||||||||||||||||
| Proceeds from Warrant Exercises | $ 5,000,000,000 | |||||||||||||||||||||||||||||||||||
| Net Issuance of preferred stock | 1,008,000,000 | 667,000,000 | 2,100,000,000 | 2,900,000,000 | 1,008,000,000 | 667,000,000 | ||||||||||||||||||||||||||||||
| Investment Warrants, Exercise Price | $ 7.142857 | |||||||||||||||||||||||||||||||||||
| Class of Warrant or Right, Exercise Price of Warrants or Rights | 30.79 | 13.30 | ||||||||||||||||||||||||||||||||||
| Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures | 74,000,000 | |||||||||||||||||||||||||||||||||||
| Shares Paid for Tax Withholding for Share Based Compensation | 29,000,000 | |||||||||||||||||||||||||||||||||||
| Number of Shares Authorized | 1,800,000,000 | |||||||||||||||||||||||||||||||||||
| Carrying Value | 13,505,000,000 | [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, Value, New Issues | 412,000,000 | 2,200,000,000 | ||||||||||||||||||||||||||||||||||
| Payments Included in Exchange of Preferred Stock and Trust Preferred Securities for Common Stock | 398,000,000 | |||||||||||||||||||||||||||||||||||
| Increase In Retained Earnings And Net Income Applicable To Common Shareholders | 246,000,000 | |||||||||||||||||||||||||||||||||||
| Dividends, Preferred Stock, Stock | 36,000,000 | (44,000,000) | ||||||||||||||||||||||||||||||||||
| Noninterest Income, Other Operating Income | (29,000,000) | (2,034,000,000) | 8,215,000,000 | 202,000,000 | ||||||||||||||||||||||||||||||||
| Proceeds from Issuance of Preferred Stock and Preference Stock | 633,000,000 | |||||||||||||||||||||||||||||||||||
| Preferred Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01 | $ 0.01 | |||||||||||||||||||||||||||||||||
| Stock Issued During Period, Common Stock in Exchange for Preferred Stock | 72,000,000 | 20,000,000 | ||||||||||||||||||||||||||||||||||
| Proceeds from Issuance of Senior Long-term Debt | 2,300,000,000 | 231,000,000 | 129,000,000 | |||||||||||||||||||||||||||||||||
| Stock Issued During Period, Common Stock in Exchange for Preferred Stock, Value | 399,000,000 | 123,000,000 | ||||||||||||||||||||||||||||||||||
| Non Cash Reduction to Preferred Stock Dividends | 184,000,000 | 17,000,000 | ||||||||||||||||||||||||||||||||||
| Per Annum Dividend Rate | 6.00% | 7.25% | 7.25% | |||||||||||||||||||||||||||||||||
| 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 | $ 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% | |||||||||||||||||||||||||||||||||||
| Preferred Stock To Be Convertible Into Common Shares | 20 | |||||||||||||||||||||||||||||||||||
| Trading Days | 20 | |||||||||||||||||||||||||||||||||||
| Consecutive Trading Days | 30 | |||||||||||||||||||||||||||||||||||
| Common Stock Closing Price Exceeds Then Applicable Conversion Price Of Preferred Stock | 1.30 | |||||||||||||||||||||||||||||||||||
| Preferred Stock, Voting Rights, Dividend Payable, Number of Semi Annual Periods in Arrears | 3 | |||||||||||||||||||||||||||||||||||
| Preferred Stock, Voting Rights, Dividend Payable, Number of Quarterly Periods in Arrears | 6 | |||||||||||||||||||||||||||||||||||
| Preferred Stock, Voting Rights, Dividends in Arrears, Number of Additional Directors to be Elected | 2 | |||||||||||||||||||||||||||||||||||
| Preferred Stock, Termination of Voting Rights, Dividend Paid, Number of Semi Annual Periods | 2 | |||||||||||||||||||||||||||||||||||
| Preferred Stock, Termination of Voting Rights, Dividend Paid, Number of Quarterly Periods | 4 | |||||||||||||||||||||||||||||||||||
| Preferred stock dividends and accretion | 1,349,000,000 | 1,428,000,000 | 1,361,000,000 | |||||||||||||||||||||||||||||||||
| Common stock issued under employee plans and related tax effects | $ 371,000,000 | $ 1,109,000,000 | $ 882,000,000 | $ 371,000,000 | $ 1,109,000,000 | $ 880,000,000 | ||||||||||||||||||||||||||||||
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