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Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Securities Loaned [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | $ 3,955 | $ 4,037
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [1] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 3,955 | 4,037
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) |  | (3,720) | (3,838)
Net Amount |  | 235 | 199
Total [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 4,465 | 4,445
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [1] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 4,465 | 4,445
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) |  | (4,212) | (4,236)
Net Amount |  | 253 | 209
Options [Member] |  |  |
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 495 | 404
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [1] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 495 | 404
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) |  | (492) | (398)
Net Amount |  | 3 | 6
Currency Forward Contracts [Member] |  |  |
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 15 | 4
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [1] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 15 | 4
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) |  |  |
Net Amount |  | $ 15 | $ 4
[1] | 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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