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Fair Value Measurements Investment Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Investments [Abstract]    
Investments $ 13,661 $ 14,500
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 1,237 337
Investment Segment [Member]    
Investments [Abstract]    
Investments 13,150 13,961
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 1,237 337
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member]    
Investments [Abstract]    
Investments 13,171 13,961
Derivative contracts, at fair value (asset) [1] 749 3
Assets, Fair Value Disclosure 13,920 13,964
Marketable Securities, Equity Securities [Abstract]    
Derivative contracts at fair value (liability) [2] 92 614
Mortgage-backed securities: [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1,350 951
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 1,258 334
Trading Securities [3] 12,927 13,659
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Basic Materials [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 3 0
Trading Securities [3] 816 0
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Communications [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 356 2,846
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Consumer, non-cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 3,493 2,308
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Consumer, cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 1,121 334
Trading Securities [3] 166 436
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Diversified [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities [3] 20 23
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Energy sector [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 1,795 1,895
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 236 417
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Funds [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 113 0
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Industrial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 21 0
Trading Securities [3] 176 99
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Technology [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities [3] 5,869 5,635
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 80 129
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Consumer, cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 63 75
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Energy sector [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 1 19
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 7
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Utilities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 16 28
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 164 173
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Consumer, non-cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 1,258 337
Investment Segment [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Funds [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 3
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Investments [Abstract]    
Investments 12,775 13,639
Derivative contracts, at fair value (asset) [1] 0 0
Assets, Fair Value Disclosure 12,775 13,639
Marketable Securities, Equity Securities [Abstract]    
Derivative contracts at fair value (liability) [2] 0 0
Mortgage-backed securities: [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1,121 334
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 1,121 334
Trading Securities [3] 12,775 13,639
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Basic Materials [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 816 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Communications [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 356 2,846
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Consumer, non-cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 3,493 2,308
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Consumer, cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 1,121 334
Trading Securities [3] 166 436
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Diversified [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities [3] 20 23
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Energy sector [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 1,795 1,895
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 128 417
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Funds [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Industrial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 176 79
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Technology [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities [3] 5,825 5,635
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Consumer, cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Energy sector [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Utilities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Consumer, non-cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 1,121 334
Investment Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Funds [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Investments [Abstract]    
Investments 333 247
Derivative contracts, at fair value (asset) [1] 749 3
Assets, Fair Value Disclosure 1,082 250
Marketable Securities, Equity Securities [Abstract]    
Derivative contracts at fair value (liability) [2] 92 614
Mortgage-backed securities: [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 229 617
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 137 0
Trading Securities [3] 152 20
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Basic Materials [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 3 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Communications [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Consumer, non-cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Consumer, cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Diversified [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Energy sector [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 108 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Funds [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 113 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Industrial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 21 0
Trading Securities [3] 0 20
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Technology [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities [3] 44 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 17 54
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Consumer, cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Energy sector [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 1 19
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 7
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Utilities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 16 28
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 164 173
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Consumer, non-cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 137 3
Investment Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Funds [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 3
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Investments [Abstract]    
Investments 63 75
Derivative contracts, at fair value (asset) [1] 0 0
Assets, Fair Value Disclosure 63 75
Marketable Securities, Equity Securities [Abstract]    
Derivative contracts at fair value (liability) [2] 0 0
Mortgage-backed securities: [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Basic Materials [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Communications [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Consumer, non-cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Consumer, cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Diversified [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Energy sector [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Funds [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Industrial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | Technology [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities [3] 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 63 75
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Consumer, cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 63 75
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Energy sector [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] | Utilities [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized Mortgage Backed Securities [Member] | Financial [Member]    
Marketable Securities, Equity Securities [Abstract]    
Trading Securities 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Consumer, non-cyclical [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value 0 0
Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] | Funds [Member]    
Marketable Securities, Equity Securities [Abstract]    
Securities sold, not yet purchased, at fair value $ 0 $ 0
[1] Included in other assets in our condensed consolidated balance sheets.
[2] Included in accrued expenses and other liabilities in our condensed consolidated balance sheets.
[3] At September 30, 2015, equity forward contracts and equity call options are included in Level 2 Investments - Financial, Technology and Industrial. At September 30, 2015, written put options are included in Level 2 Investments - Basic Materials and Funds. At December 31, 2014, equity call options are included in Level 2 Investments - Industrial and written put options on debt securities are included in Level 2 Investments - Funds.