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Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Offsetting Securities Loaned [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | $ 10,535 | $ 9,838
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [1] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 10,535 | 9,838
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) |  | (9,934) | (9,246)
Net Amount |  | 601 | 592
Total [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 10,614 | 9,871
Amounts Offset in the Consolidated Statement of Financial Condition | [1] |  |
Net Amounts Presented in the Consolidated Statement of Financial Condition |  | 10,614 | 9,871
Amounts of Liabilities Not Offset in the Consolidated Statement of Financial Condition (Cash or Financial Instruments) |  | (9,965) | (9,271)
Net Amount |  | 649 | 600
Options [Member] |  |  |
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 32 | 26
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [1] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 32 | 26
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) |  | (31) | (25)
Net Amount |  | 1 | 1
Currency Forward Contracts [Member] |  |  |
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract] |  |  |
Gross Amounts of Financial Assets Recognized |  | 47 | 7
Amounts Offset in the Condensed Consolidated Statement of Financial Condition | [1] |  |
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition |  | 47 | 7
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments) |  |  |
Net Amount |  | $ 47 | $ 7
[1] | The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at September 30, 2021 and December 31, 2020.

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