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Fair Value Measurements Investment Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Investments [Abstract]    
Investments $ 14,463 $ 12,261
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 1,111 884
Investment Segment [Member]
    
Investments [Abstract]    
Investments 13,910 11,826
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 1,111 884
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 13,590 11,130
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 13,590 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 1,073 876
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 13,590 11,130
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 1,073 876
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 2,940 820
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 2,077 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 385 414
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 1,064 787
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 24 29
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 2,409 3,050
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 435 300
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 0 45
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: | Equity securities, industrial [Member]
    
Investments [Abstract]    
Trading securities 53 0
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities: | Technology
    
Investments [Abstract]    
Trading securities 5,267 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 245 409
Derivative contracts, at fair value (asset) 183 [1] 0 [1]
Fair value of investment and derivative assets 428 409
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 103 [2] 639 [2]
Fair value of derivative and other liabilities 141 647
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 25 184
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 38 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 0 0
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
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: | Funds
    
Investments [Abstract]    
Trading securities 8 6
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 38 [3] 8
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities: | Equity securities, industrial [Member]
    
Investments [Abstract]    
Trading securities 17 0
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 44 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 10 11
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt
    
Investments [Abstract]    
Trading securities 0 5
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt: | Utilities
    
Investments [Abstract]    
Trading securities 34 29
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial
    
Investments [Abstract]    
Trading securities 176 180
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 75 287
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 75 287
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 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 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
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: | 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: | Equity securities, industrial [Member]
    
Investments [Abstract]    
Trading securities 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] | Corporate debt:
    
Investments [Abstract]    
Trading securities 75 287
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 75 287
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 13,910 11,826
Derivative contracts, at fair value (asset) 183 [1] 0 [1]
Fair value of investment and derivative assets 14,093 11,826
Securities sold, not yet purchased, at fair value:    
Derivative contracts at fair value (liability) 103 [2] 639 [2]
Fair value of derivative and other liabilities 1,214 1,523
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities:
    
Investments [Abstract]    
Trading securities 13,615 11,314
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 1,111 884
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Communications
    
Investments [Abstract]    
Trading securities 2,940 820
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 2,077 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 385 414
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 1,064 787
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Diversified
    
Investments [Abstract]    
Trading securities 24 29
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Energy
    
Investments [Abstract]    
Trading securities 2,409 3,050
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Financial
    
Investments [Abstract]    
Trading securities 435 300
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 8 6
Securities sold, not yet purchased, at fair value:    
Securities sold, not yet purchased, at fair value 38 8
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Equity securities, industrial [Member]
    
Investments [Abstract]    
Trading securities 70 0
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Equity securities: | Technology
    
Investments [Abstract]    
Trading securities 5,267 3,173
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt:
    
Investments [Abstract]    
Trading securities 119 332
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Consumer, cyclical
    
Investments [Abstract]    
Trading securities 75 287
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Financial
    
Investments [Abstract]    
Trading securities 10 11
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Sovereign debt
    
Investments [Abstract]    
Trading securities 0 5
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Corporate debt: | Utilities
    
Investments [Abstract]    
Trading securities 34 29
Investment Segment [Member] | Total fair value [Member] | Recurring measurement [Member] | Mortgage-backed securities: | Financial
    
Investments [Abstract]    
Trading securities $ 176 $ 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 September 30, 2014.