Financial Instruments Subject to Off-Balance Sheet Credit Risk (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2019	Dec. 31, 2018
Resale agreements
Gross Assets	$ 9,707	$ 7,195
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	9,707	7,195
Counterparty Offsetting	0	0
Collateral	(9,707)	(7,195)
Net Amount	0	0
Securities borrowed
Gross Assets	877	101
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	877	101
Counterparty Offsetting	(871)	(98)
Collateral	(6)	(3)
Net Amount	0	0
Total Gross Assets	10,584	7,296
Total Assets, Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Total Assets, Net Amounts Presented in the Condensed Consolidated Balance Sheets	10,584	7,296
Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting	(871)	(98)
Total Assets, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(9,713)	(7,198)
Total Assets, Net Amount	0	0
Securities loaned
Gross Liabilities	1,471	1,184
Gross Amounts Offset in the Condensed Consolidated Balance Sheets	0	0
Net Amounts Presented in the Condensed Consolidated Balance Sheets	1,471	1,184
Counterparty Offsetting	(871)	(98)
Collateral	(489)	(975)
Net Amount	111	111
Total Gross Liabilities	1,471	1,184
Total Liabilities, Net Amounts Presented in the Consolidated Balance Sheet	1,471	1,184
Total Liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheet, Counterparty Offsetting	(871)	(98)
Total Liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral	(489)	(975)
Total Liabilities, Net Amount	111	111
Offsetting Assets [Line Items]
Fair value of client securities available to be pledged	$ 26,614	$ 26,628
Resale And Repurchase Agreements [Member]
Offsetting Assets [Line Items]
Percentage of collateral to related assets	102.00%	102.00%
Fair value of client securities available to be pledged	$ 9,900	$ 7,400

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