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Fair Value Measurements Investment Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investments [Abstract]    
Investments $ 17,227 $ 12,261
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 929 884
Investment Segment [Member]
    
Investments [Abstract]    
Investments 16,585 11,826
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 929 884
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 15,918 11,130
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 15,918 11,130
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 900 876
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 15,918 11,130
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 900 876
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 1,924 820
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 9 0
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 4,147 3,344
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 44
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 1,150 414
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 891 787
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 26 29
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 3,071 3,050
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 485 300
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
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Technology
    
Investments [Abstract]    
Trading securities 5,115 3,173
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 557 409
Derivative contracts, at fair value (asset) 2 [1] 0 [1]
Fair value of investment and derivative assets 559 409
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 1,420 [2] 639 [2]
Fair value of derivative and other liabilities 1,449 647
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 327 184
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 29 8
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 22 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: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 93 178
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: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 212 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 0 0
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 6
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 29 [3] 8
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] | Corporate debt:
    
Investments [Abstract]    
Trading securities 52 45
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 11
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 36 29
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial
    
Investments [Abstract]    
Trading securities 178 180
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 110 287
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 110 287
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: | Communications
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0  
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 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  
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  
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] | Corporate debt:
    
Investments [Abstract]    
Trading securities 110 287
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 110 287
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 16,585 11,826
Derivative contracts, at fair value (asset) 2 [1] 0 [1]
Fair value of investment and derivative assets 16,587 11,826
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 1,420 [2] 639 [2]
Fair value of derivative and other liabilities 2,349 1,523
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 16,245 11,314
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 929 884
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 1,946 820
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 9 0
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 4,240 3,522
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 44
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 1,362 414
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 891 787
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 26 29
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 3,071 3,050
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 485 300
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 45
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Funds
    
Investments [Abstract]    
Trading securities 0 6
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 29 8
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Technology
    
Investments [Abstract]    
Trading securities 5,115 3,173
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt:
    
Investments [Abstract]    
Trading securities 162 332
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 110 287
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Financial
    
Investments [Abstract]    
Trading securities 11 11
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 36 29
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial
    
Investments [Abstract]    
Trading securities $ 178 $ 180
[1] Included in other assets in our consolidated balance sheets.
[2] Included in accrued expenses and other liabilities in our consolidated balance sheets
[3] Includes $1 million of debt related securities as of June 30, 2014.