Securities Financing Arrangements - Schedule of Offsetting Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Derivative assets
Gross Amounts of Recognized Assets	$ 2,697	$ 1,233
Gross Amounts Offset in Balance Sheet	705	264
Net Amounts Presented in Balance Sheet	1,992	969
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	65	26
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	1,927	943
Securities borrowed or purchased under resale agreements
Gross Amounts of Recognized Assets	20,193	29,483
Gross Amounts Offset in Balance Sheet	4,478	5,540
Net Amounts Presented in Balance Sheet	15,715	23,943
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	15,635	23,844
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	80	99
Total Financial Assets
Gross Amounts of Recognized Assets	22,890	30,716
Gross Amounts Offset in Balance Sheet	5,183	5,804
Net Amounts Presented in Balance Sheet	17,707	24,912
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	15,700	23,870
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	2,007	1,042
Derivative liabilities
Gross Amounts of Recognized Liabilities	1,185	523
Gross Amounts Offset in Balance Sheet	663	306
Net Amounts Presented in Balance Sheet	522	217
Gross Amount Not Offset in Balance Sheet, Financial Instruments	190	129
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	1	1
Net Amount	331	87
Securities Sold under Agreements to Repurchase and Securities Loaned, Gross Amounts of Recognized on Balance Sheet	27,101	34,406
Securities Sold under Agreements to Repurchase and Securities Loaned, Gross Amounts Offset on Balance Sheet	4,478	5,540
Securities loaned or sold under repurchase agreements
Net Amounts Presented in Balance Sheet	22,623	28,866
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	21,781	27,957
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	842	909
Total Financial Liabilities
Gross Amounts of Recognized Assets/Liabilities	28,286	34,929
Gross Amounts Offset in Balance Sheet	5,141	5,846
Net Amounts Presented in Balance Sheet	23,145	29,083
Gross Amount Not Offset in Balance Sheet, Financial Instruments	21,971	28,086
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	1	1
Net Amount	$ 1,173	$ 996

Offsetting Securities Purchased Under Agreements to Resell and Securities Borrowed [Abstract]

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against securities purchased under agreement to resell.

+ References

+ Details

Name:	us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of obligation to return securities collateral under master netting arrangements that have not been offset against securities purchased under agreement to resell.

+ References

+ Details

Name:	us-gaap_SecuritiesPurchasedUnderAgreementsToResellCollateralObligationToReturnSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before effects of master netting arrangements, of 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

+ Details

Name:	us-gaap_SecuritiesPurchasedUnderAgreementsToResellGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

+ Details

Name:	us-gaap_SecuritiesPurchasedUnderAgreementsToResellLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase.

+ References

+ Details

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of right to receive securities collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase.

+ References

+ Details

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant