Securities Financing Arrangements - Schedule of Offsetting Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative assets
Gross Amounts of Recognized Assets	$ 2,545	$ 1,233
Gross Amounts Offset in Balance Sheet	526	264
Net Amounts Presented in Balance Sheet	2,019	969
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	49	26
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	1,970	943
Securities borrowed or purchased under resale agreements
Gross Amounts of Recognized Assets	24,143	29,483
Gross Amounts Offset in Balance Sheet	6,608	5,540
Net Amounts Presented in Balance Sheet	17,535	23,943
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	17,435	23,844
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	100	99
Total Financial Assets
Gross Amounts of Recognized Assets	26,688	30,716
Gross Amounts Offset in Balance Sheet	7,134	5,804
Net Amounts Presented in Balance Sheet	19,554	24,912
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	17,484	23,870
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	2,070	1,042
Derivative liabilities
Gross Amounts of Recognized Liabilities	929	523
Gross Amounts Offset in Balance Sheet	649	306
Net Amounts Presented in Balance Sheet	280	217
Gross Amount Not Offset in Balance Sheet, Financial Instruments	185	129
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	1
Net Amount	95	87
Securities Sold under Agreements to Repurchase and Securities Loaned, Gross Amounts of Recognized on Balance Sheet	30,040	34,406
Securities Sold under Agreements to Repurchase and Securities Loaned, Gross Amounts Offset on Balance Sheet	6,608	5,540
Securities loaned or sold under repurchase agreements
Net Amounts Presented in Balance Sheet	23,432	28,866
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	22,744	27,957
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	688	909
Total Financial Liabilities
Gross Amounts of Recognized Assets/Liabilities	30,969	34,929
Gross Amounts Offset in Balance Sheet	7,257	5,846
Net Amounts Presented in Balance Sheet	23,712	29,083
Gross Amount Not Offset in Balance Sheet, Financial Instruments	22,929	28,086
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	1
Net Amount	$ 783	$ 996

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

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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