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Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Securities, Segregated For Regulatory Purposes, Purchased Under Agreements To Resell [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized | [1] | $ 17,459 | $ 11,382
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 17,459 | 11,382
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  | (17,459) | (11,382)
Net Amount |  |  |
Offsetting Securities Borrowed [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 4,010 | 3,331
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 4,010 | 3,331
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  | (3,856) | (3,199)
Net Amount |  | 154 | 132
Offsetting Securities Purchased under Agreements to Resell [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 1,391 | 1,242
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 1,391 | 1,242
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  | (1,391) | (1,242)
Net Amount |  |  |
Total [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 24,155 | 17,463
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 24,155 | 17,463
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  | (23,198) | (16,221)
Net Amount |  | 957 | 1,242
Options [Member] |  |  |
Offsetting Financial Instruments Owned, At Fair Value [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 1,293 | 1,479
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 1,293 | 1,479
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  | (492) | (398)
Net Amount |  | 801 | 1,081
Warrants [Member] |  |  |
Offsetting Financial Instruments Owned, At Fair Value [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  |  | 1
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  |  | 1
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  |  |
Net Amount |  |  | 1
Currency Forward Contracts [Member] |  |  |
Offsetting Financial Instruments Owned, At Fair Value [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 2 | 28
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 2 | 28
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  |  |
Net Amount |  | $ 2 | $ 28
[1] | As of September 30, 2019 and December 31, 2018, the Company had $17.5 billion and $11.4 billion, respectively, of securities purchased under agreements to resell that were segregated to satisfy regulatory requirements. These securities are included in “Securities - segregated for regulatory purposes” in the condensed consolidated statements of financial condition.
[2] | The Company did no t have any balances eligible for netting in accordance with ASC Topic 210-20 at September 30, 2019 and December 31, 2018.

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- Definition Amount of liability associated with funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226003-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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