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Fair Value Measurements Investment Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Investments [Abstract]    
Investments $ 12,261 $ 5,491
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 884 533
Investment Segment [Member]
    
Investments [Abstract]    
Investments 11,826 5,084
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 884 533
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 11,130 4,134
Securities sold, not yet purchased, at fair value: [Abstract]    
Derivative contracts, Liabilities at fair value 0 [1] 0 [1]
Fair value of investment and derivative liabilities 876 473
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities
    
Investments [Abstract]    
Trading securities 11,130 4,134
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 876 473
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities | Basic materials [Member]
    
Investments [Abstract]    
Trading securities 0 144
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities | Communications [Member]
    
Investments [Abstract]    
Trading securities 820 560
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities | Consumer, non-cyclical [Member]
    
Investments [Abstract]    
Trading securities 3,344 1,340
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 44 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities | Consumer, cyclical [Member]
    
Investments [Abstract]    
Trading securities 414 261
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 787 473
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities | Diversified [Member]
    
Investments [Abstract]    
Trading securities 29 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities | Energy Segment [Member]
    
Investments [Abstract]    
Trading securities 3,050 1,052
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities | Financial [Member]
    
Investments [Abstract]    
Trading securities 300 244
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 45 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities | Funds [Member]
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities | Technology [Member]
    
Investments [Abstract]    
Trading securities 3,173 325
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Equity securities | Utilities [Member]
    
Investments [Abstract]    
Trading securities 0 208
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Consumer, cyclical [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Financial [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Sovereign debt [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Utilities [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Recurring measurement [Member] | Mortgage-backed securities [Member] | Financial [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 409 662
Securities sold, not yet purchased, at fair value: [Abstract]    
Derivative contracts, Liabilities at fair value 639 [1] 84 [1]
Fair value of investment and derivative liabilities 647 144
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities
    
Investments [Abstract]    
Trading securities 184 388
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 8 60
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities | Basic materials [Member]
    
Investments [Abstract]    
Trading securities 0 9
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities | Communications [Member]
    
Investments [Abstract]    
Trading securities 0 16
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities | Consumer, non-cyclical [Member]
    
Investments [Abstract]    
Trading securities 178 0
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities | Consumer, cyclical [Member]
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities | Diversified [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities | Energy Segment [Member]
    
Investments [Abstract]    
Trading securities 0 55
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities | Financial [Member]
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities | Funds [Member]
    
Investments [Abstract]    
Trading securities 6 308
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 8 60
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities | Technology [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Equity securities | Utilities [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member]
    
Investments [Abstract]    
Trading securities 45 86
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Consumer, cyclical [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Financial [Member]
    
Investments [Abstract]    
Trading securities 11 50
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Sovereign debt [Member]
    
Investments [Abstract]    
Trading securities 5 5
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Utilities [Member]
    
Investments [Abstract]    
Trading securities 29 31
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Recurring measurement [Member] | Mortgage-backed securities [Member] | Financial [Member]
    
Investments [Abstract]    
Trading securities 180 188
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 287 288
Securities sold, not yet purchased, at fair value: [Abstract]    
Derivative contracts, Liabilities at fair value 0 [1] 0 [1]
Fair value of investment and derivative liabilities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities | Basic materials [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities | Communications [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities | Consumer, non-cyclical [Member]
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities | Consumer, cyclical [Member]
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities | Diversified [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities | Energy Segment [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities | Financial [Member]
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities | Funds [Member]
    
Investments [Abstract]    
Trading securities 0 0
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities | Technology [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Equity securities | Utilities [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Corporate debt [Member]
    
Investments [Abstract]    
Trading securities 287 288
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Consumer, cyclical [Member]
    
Investments [Abstract]    
Trading securities 287 288
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Financial [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Sovereign debt [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Utilities [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Mortgage-backed securities [Member] | Financial [Member]
    
Investments [Abstract]    
Trading securities 0 0
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member]
    
Investments [Abstract]    
Investments 11,826 5,084
Securities sold, not yet purchased, at fair value: [Abstract]    
Derivative contracts, Liabilities at fair value 639 [1] 84 [1]
Fair value of investment and derivative liabilities 1,523 617
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities
    
Investments [Abstract]    
Trading securities 11,314 4,522
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 884 533
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities | Basic materials [Member]
    
Investments [Abstract]    
Trading securities 0 153
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities | Communications [Member]
    
Investments [Abstract]    
Trading securities 820 576
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities | Consumer, non-cyclical [Member]
    
Investments [Abstract]    
Trading securities 3,522 1,340
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 44 0
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities | Consumer, cyclical [Member]
    
Investments [Abstract]    
Trading securities 414 261
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 787 473
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities | Diversified [Member]
    
Investments [Abstract]    
Trading securities 29 0
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities | Energy Segment [Member]
    
Investments [Abstract]    
Trading securities 3,050 1,107
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities | Financial [Member]
    
Investments [Abstract]    
Trading securities 300 244
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 45 0
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities | Funds [Member]
    
Investments [Abstract]    
Trading securities 6 308
Securities sold, not yet purchased, at fair value: [Abstract]    
Securities sold, not yet purchased, at fair value 8 60
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities | Technology [Member]
    
Investments [Abstract]    
Trading securities 3,173 325
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Equity securities | Utilities [Member]
    
Investments [Abstract]    
Trading securities 0 208
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Corporate debt [Member]
    
Investments [Abstract]    
Trading securities 332 374
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Corporate debt [Member] | Consumer, cyclical [Member]
    
Investments [Abstract]    
Trading securities 287 288
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Corporate debt [Member] | Financial [Member]
    
Investments [Abstract]    
Trading securities 11 50
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Corporate debt [Member] | Sovereign debt [Member]
    
Investments [Abstract]    
Trading securities 5 5
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Corporate debt [Member] | Utilities [Member]
    
Investments [Abstract]    
Trading securities 29 31
Investment Segment [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Recurring measurement [Member] | Mortgage-backed securities [Member] | Financial [Member]
    
Investments [Abstract]    
Trading securities $ 180 $ 188
[1] Included in accrued expenses and other liabilities in our consolidated balance sheets.