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Fair Value Measurements Investment Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investments [Abstract]    
Investments $ 14,846 $ 12,261
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 898 884
Investment Segment [Member]
    
Investments [Abstract]    
Investments 14,413 11,826
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 898 884
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 13,609 11,130
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 13,609 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 898 876
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 13,609 11,130
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 898 876
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 1,861 820
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 3,719 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 368 414
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 880 787
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 28 29
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 2,798 3,050
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 480 300
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 4,355 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 518 409
Derivative contracts, at fair value (asset) 1 [1] 0 [1]
Fair value of investment and derivative assets 519 409
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 820 [2] 639 [2]
Fair value of derivative and other liabilities 820 647
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 293 184
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 8
Investment Segment [Member] | Level 2 [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 0
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Consumer, non-cyclical
    
Investments [Abstract]    
Trading securities 0 178
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 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 293 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 0 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 47 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 31 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 286 287
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 286 287
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 286 287
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 286 287
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 14,413 11,826
Derivative contracts, at fair value (asset) 1 [1] 0 [1]
Fair value of investment and derivative assets 14,414 11,826
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 820 [2] 639 [2]
Fair value of derivative and other liabilities 1,718 1,523
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 13,902 11,314
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 898 884
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 1,861 820
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 3,719 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 368 414
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 880 787
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 28 29
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 3,091 3,050
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 480 300
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 9 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 0 8
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Technology
    
Investments [Abstract]    
Trading securities 4,355 3,173
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt:
    
Investments [Abstract]    
Trading securities 333 332
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 286 287
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 31 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.