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Fair Value Measurements Investment Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investments [Abstract]    
Investments $ 12,275 $ 5,491
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 704 533
Investment Segment [Member]
    
Investments [Abstract]    
Investments 11,825 5,084
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 704 533
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 11,122 4,134
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 11,122 4,134
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 0 [2] 0 [2]
Fair value of derivative and other liabilities 704 473
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 11,122 4,134
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 704 473
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Basic materials
    
Investments [Abstract]    
Trading securities 46 144
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 1,567 560
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 2,101 1,340
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 395 261
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 704 473
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 27 0
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 2,244 1,052
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 282 244
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Funds
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Technology
    
Investments [Abstract]    
Trading securities 4,460 325
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Utilities
    
Investments [Abstract]    
Trading securities 0 208
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt:
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt: | Financial
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt: | Utilities
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 415 662
Derivative contracts, at fair value (asset) 26 [1] 0 [1]
Fair value of investment and derivative assets 441 662
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 499 [2] 84 [2]
Fair value of derivative and other liabilities 499 144
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 199 388
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 60
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Basic materials
    
Investments [Abstract]    
Trading securities 31 9
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 20 16
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 148 55
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Funds
    
Investments [Abstract]    
Trading securities 0 308
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 60
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Technology
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Utilities
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt:
    
Investments [Abstract]    
Trading securities 44 86
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Financial
    
Investments [Abstract]    
Trading securities 11 50
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt
    
Investments [Abstract]    
Trading securities 5 5
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Utilities
    
Investments [Abstract]    
Trading securities 28 31
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial
    
Investments [Abstract]    
Trading securities 172 188
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 288 288
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 288 288
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 0 [2] 0 [2]
Fair value of derivative and other liabilities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Basic materials
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 0  
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Funds
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Technology
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Utilities
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt:
    
Investments [Abstract]    
Trading securities 288 288
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 288 288
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Financial
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Utilities
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 11,825 5,084
Derivative contracts, at fair value (asset) 26 [1] 0 [1]
Fair value of investment and derivative assets 11,851 5,084
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 499 [2] 84 [2]
Fair value of derivative and other liabilities 1,203 617
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 11,321 4,522
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 704 533
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Basic materials
    
Investments [Abstract]    
Trading securities 77 153
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 1,587 576
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 2,101 1,340
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 395 261
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 704 473
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 27 0
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 2,392 1,107
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 282 244
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Funds
    
Investments [Abstract]    
Trading securities 0 308
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 60
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Technology
    
Investments [Abstract]    
Trading securities 4,460 325
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Utilities
    
Investments [Abstract]    
Trading securities 0 208
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt:
    
Investments [Abstract]    
Trading securities 332 374
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 288 288
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Financial
    
Investments [Abstract]    
Trading securities 11 50
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt
    
Investments [Abstract]    
Trading securities 5 5
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Utilities
    
Investments [Abstract]    
Trading securities 28 31
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial
    
Investments [Abstract]    
Trading securities $ 172 $ 188
[1] Included in other assets in our consolidated balance sheets.
[2] Included in accrued expenses and other liabilities in our consolidated balance sheets.