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Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities, Segregated For Regulatory Purposes, Purchased Under Agreements To Resell [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized | [1] | $ 11,382 | $ 9,166
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 11,382 | 9,166
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  | (11,382) | (9,166)
Net Amount |  |  |
Offsetting Securities Borrowed [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 3,331 | 2,957
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 3,331 | 2,957
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  | (3,199) | (2,822)
Net Amount |  | 132 | 135
Offsetting Securities Purchased under Agreements to Resell [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 1,242 | 2,035
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 1,242 | 2,035
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  | (1,242) | (2,035)
Net Amount |  |  |
Total [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 17,463 | 15,247
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 17,463 | 15,247
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  | (16,221) | (14,474)
Net Amount |  | 1,242 | 773
Options [Member] |  |  |
Offsetting Financial Instruments Owned, At Fair Value [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 1,479 | 1,052
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 1,479 | 1,052
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  | (398) | (451)
Net Amount |  | 1,081 | 601
Warrants [Member] |  |  |
Offsetting Financial Instruments Owned, At Fair Value [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 1 | 5
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 1 | 5
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  |  |
Net Amount |  | 1 | 5
Currency Forward Contracts [Member] |  |  |
Offsetting Financial Instruments Owned, At Fair Value [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 28 | 32
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [2] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 28 | 32
Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition: Cash or Financial Instruments |  |  |
Net Amount |  | $ 28 | $ 32
[1] | As of December 31, 2018 and December 31, 2017, the Company had $11.4 billion and $9.2 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 consolidated statements of financial condition.
[2] | The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at December 31, 2018 and 2017.

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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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