Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Preferred Stock and Trust Preferred Securites (Details)

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Shareholders' Equity - Preferred Stock and Trust Preferred Securites (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Series D Preferred Stock [Member]
Dec. 31, 2012
Series E Preferred Stock [Member]
Dec. 31, 2012
Series J Preferred Stock [Member]
Dec. 31, 2012
Series K Preferred Stock [Member]
Dec. 31, 2012
Series M Preferred Stock [Member]
Dec. 31, 2012
Series 1 Preferred Stock [Member]
Dec. 31, 2012
Series 2 Preferred Stock [Member]
Dec. 31, 2012
Series 3 Preferred Stock [Member]
Dec. 31, 2012
Series 4 Preferred Stock [Member]
Dec. 31, 2012
Series 5 Preferred Stock [Member]
Dec. 31, 2012
Series 6 Preferred Stock [Member]
Dec. 31, 2012
Series L Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series D Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series E Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series J Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series K Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series M Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series 1 Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series 2 Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series 3 Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series 4 Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series 5 Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series 6 Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Non-Convertible Preferred Stock [Member]
Dec. 31, 2012
Exchange Offer [Member]
Series L Preferred Stock [Member]
Sep. 30, 2012
Exchange Agreements [Member]
Common Stock [Member]
Dec. 31, 2011
Exchange Agreements [Member]
Common Stock [Member]
Sep. 30, 2012
Exchange Agreements [Member]
Non-Convertible Preferred Stock and Trust Preferred Securities [Member]
Mar. 31, 2012
Exchange Agreement Non-Convertible Preferred Stock for Common Stock [Member]
Non-Convertible Preferred Stock [Member]
Dec. 31, 2011
Exchange Agreement Non-Convertible Preferred Stock for Common Stock [Member]
Non-Convertible Preferred Stock [Member]
Class of Stock [Line Items]                                                                    
Other income (loss) $ (1,839) $ 6,869 $ 2,384                                                         $ 202    
Issuance of common stock                                                           412 2,200      
Payments Included in Exchange of Preferred Stock and Trust Preferred Securities for Common Stock                                                           398        
Preferred Stock, Including Additional Paid in Capital 19,067 [1]     654 [1],[2],[3] 317 [1],[2],[3] 951 [1],[2],[3] 1,544 [1],[2],[4] 1,310 [1],[2],[4] 98 [1],[2],[5] 299 [1],[2],[5] 653 [1],[2],[5] 210 [1],[2],[5] 422 [1],[2],[5] 59 [1],[2],[6] 3,080 [1]                                   296 814
Preferred Shares Exchanged                               314,584 260 6,800 1,058 4,929 4,958 1,587 7,579 563 5,965 6,134 5,612 45,445 269,139          
Liquidation Value                               1,380 [7],[8] 7 [7],[8] 170 [7],[8] 26 [7],[8] 123 [7],[8] 124 [7],[8] 47 [7],[8] 227 [7],[8] 17 [7],[8] 179 [7],[8] 185 [7],[8] 6 [7],[8] 1,111 [7],[8] 269 [7],[8]          
Preferred Share Exchanged Carrying Value                               1,379                                    
Increase In Retained Earnings And Net Income Applicable To Common Shareholders                                                               $ 246    
[1] Amounts shown are before third-party issuance costs and other Merrill Lynch purchase accounting related adjustments of $299 million.
[2] The Corporation may redeem series of preferred stock on or after the redemption date, in whole or in part, at its option, at the liquidation preference plus declared and unpaid dividends.
[3] Ownership is held in the form of depositary shares, each representing a 1/1,000th interest in a share of preferred stock, paying a quarterly cash dividend, if and when declared.
[4] Ownership is held in the form of depositary shares, each representing a 1/25th interest in a share of preferred stock, paying a semi-annual cash dividend, if and when declared, until the redemption date adjusts to a quarterly cash dividend, if and when declared, thereafter.
[5] Ownership is held in the form of depositary shares, each representing a 1/1,200th interest in a share of preferred stock, paying a quarterly cash dividend, if and when declared.
[6] Ownership is held in the form of depositary shares, each representing a 1/40th interest in a share of preferred stock, paying a quarterly cash dividend, if and when declared.
[7] Carrying value of preferred stock exchanged was $1,379 million.
[8] Amounts shown are before third-party issuance costs.