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Fair Value Measurements Investment Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Investments [Abstract]    
Investments $ 9,604 $ 5,491
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 667 533
Investment Segment [Member]
    
Investments [Abstract]    
Investments 9,123 5,084
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 667 533
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 8,323 4,134
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 8,323 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 667 473
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 8,323 4,134
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 667 473
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Basic materials
    
Investments [Abstract]    
Trading securities 47 144
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 1,161 560
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 2,093 1,340
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 271 261
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 667 473
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 26 0
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 1,901 1,052
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 224 244
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 2,600 325
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 511 662
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 511 662
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 658 [2] 84 [2]
Fair value of derivative and other liabilities 658 144
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 291 388
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 26 9
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 14 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 123 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 128 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 45 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 4 5
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Utilities
    
Investments [Abstract]    
Trading securities 30 31
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial
    
Investments [Abstract]    
Trading securities 175 188
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 289 288
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 289 288
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 289 288
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 289 288
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 9,123 5,084
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 9,123 5,084
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 658 [2] 84 [2]
Fair value of derivative and other liabilities 1,325 617
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 8,614 4,522
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 667 533
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Basic materials
    
Investments [Abstract]    
Trading securities 73 153
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 1,175 576
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 2,093 1,340
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 271 261
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 667 473
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 26 0
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 2,024 1,107
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 224 244
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 2,728 325
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 334 374
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 289 288
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 4 5
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Utilities
    
Investments [Abstract]    
Trading securities 30 31
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial
    
Investments [Abstract]    
Trading securities $ 175 $ 188
[1] Included in other assets in our consolidated balance sheets.
[2] Included in accrued expenses and other liabilities in our consolidated balance sheets.