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Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Offsetting Securities Loaned [Abstract]
Gross Amounts of Financial Assets Recognized		$ 4,250	$ 4,037
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		4,250	4,037
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments)		(4,019)	(3,838)
Net Amount		231	199
Total [Abstract]
Gross Amounts of Financial Assets Recognized		4,316	4,445
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		4,316	4,445
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments)		(4,059)	(4,236)
Net Amount		257	209
Options [Member]
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]
Gross Amounts of Financial Assets Recognized		48	404
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		48	404
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments)		(40)	(398)
Net Amount		8	6
Currency Forward Contracts [Member]
Offsetting Financial Instruments Sold, But Not Yet Purchased, At Fair Value [Abstract]
Gross Amounts of Financial Assets Recognized		18	4
Amounts Offset in the Condensed Consolidated Statement of Financial Condition	[1]
Net Amounts Presented in the Condensed Consolidated Statement of Financial Condition		18	4
Amounts of Liabilities Not Offset in the Condensed Consolidated Statement of Financial Condition (Cash or Financial Instruments)
Net Amount		$ 18	$ 4
[1] The Company did not have any balances eligible for netting in accordance with ASC Topic 210-20 at March 31, 2019 and December 31, 2018.

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