Securities Financing Agreements (Offsetting Financing Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivative assets
Gross Amounts of Recognized Assets/Liabilities	$ 1,233	$ 871
Gross Amounts Offset in Balance Sheet	264	354
Net Amounts Presented in Balance Sheet	969	517
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	26	14
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	943	503
Securities borrowed or purchased under resale agreements
Gross Amounts of Recognized Assets/Liabilities	29,483	33,974
Gross Amounts Offset in Balance Sheet	5,540	11,606
Net Amounts Presented in Balance Sheet	23,943	22,368
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	23,844	22,291
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	99	77
Total Financial Assets
Gross Amounts of Recognized Assets/Liabilities	30,716	34,845
Gross Amounts Offset in Balance Sheet	5,804	11,960
Net Amounts Presented in Balance Sheet	24,912	22,885
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	23,870	22,305
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	1,042	580
Derivative liabilities
Gross Amounts of Recognized Assets/Liabilities	523	804
Gross Amounts Offset in Balance Sheet	306	322
Net Amounts Presented in Balance Sheet	217	482
Gross Amount Not Offset in Balance Sheet, Financial Instruments	129	69
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	1	0
Net Amount	87	413
Securities loaned or sold under repurchase agreements
Gross Amounts of Recognized Assets/Liabilities	34,406	38,891
Gross Amounts Offset in Balance Sheet	5,540	11,606
Net Amounts Presented in Balance Sheet	28,866	27,285
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	27,957	26,434
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	909	851
Total Financial Liabilities
Gross Amounts of Recognized Assets/Liabilities	34,929	39,695
Gross Amounts Offset in Balance Sheet	5,846	11,928
Net Amounts Presented in Balance Sheet	29,083	27,767
Gross Amount Not Offset in Balance Sheet, Financial Instruments	28,086	26,503
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	1	0
Net Amount	$ 996	$ 1,264

Securities Purchased Under Agreements to Resell and Securities Borrowed

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Securities Sold under Agreements to Repurchase and Securities Loaned

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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

- References

No definition available.

+ Details

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateralAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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