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Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Offsetting Securities Loaned [Abstract] |  |
Gross Amounts of Financial Assets Recognized | $ 3,617 | $ 2,894
Amounts Offset in the Condensed Consolidated Statement of Financial Condition |  |
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition | 3,617 | 2,894
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) | (3,520) | (2,773)
Net Amount | 97 | 121
Total [Abstract] |  |
Gross Amounts of Financial Assets Recognized | 4,677 | 3,946
Amounts Offset in the Condensed Consolidated Statement of Financial Condition |  |
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition | 4,677 | 3,946
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) | (4,552) | (3,806)
Net Amount | 125 | 140
Options [Member] |  |
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract] |  |
Gross Amounts of Financial Assets Recognized | 1,058 | 1,042
Amounts Offset in the Condensed Consolidated Statement of Financial Condition |  |
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition | 1,058 | 1,042
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) | (1,031) | (1,032)
Net Amount | 27 | 10
Warrants And Discount Certificates [Member] |  |
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract] |  |
Gross Amounts of Financial Assets Recognized | 1 | 1
Amounts Offset in the Condensed Consolidated Statement of Financial Condition |  |
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition | 1 | 1
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) | (1) | (1)
Currency Forward Contracts [Member] |  |
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract] |  |
Gross Amounts of Financial Assets Recognized | 1 | 9
Amounts Offset in the Condensed Consolidated Statement of Financial Condition |  |
Net Amounts Presented in Condensed Consolidated Statement of Financial Condition | 1 | 9
Net Amount | $ 1 | $ 9

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