Securities Financing Arrangements - Schedule of Offsetting Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative assets
Gross Amounts of Recognized Assets	$ 1,297	$ 871
Gross Amounts Offset in Balance Sheet	337	354
Net Amounts Presented in Balance Sheet	960	517
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	30	14
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	930	503
Securities borrowed or purchased under resale agreements
Gross Amounts of Recognized Assets	31,519	33,974
Gross Amounts Offset in Balance Sheet	7,513	11,606
Net Amounts Presented in Balance Sheet	24,006	22,368
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	23,910	22,291
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	96	77
Total Financial Assets
Gross Amounts of Recognized Assets	32,816	34,845
Gross Amounts Offset in Balance Sheet	7,850	11,960
Net Amounts Presented in Balance Sheet	24,966	22,885
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	23,940	22,305
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	1,026	580
Derivative liabilities
Gross Amounts of Recognized Liabilities	713	804
Gross Amounts Offset in Balance Sheet	365	322
Net Amounts Presented in Balance Sheet	348	482
Gross Amount Not Offset in Balance Sheet, Financial Instruments	114	69
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	1	0
Net Amount	233	413
Securities Sold under Agreements to Repurchase and Securities Loaned, Gross Amounts of Recognized on Balance Sheet	36,430	38,891
Securities Sold under Agreements to Repurchase and Securities Loaned, Gross Amounts Offset on Balance Sheet	7,513	11,606
Securities loaned or sold under repurchase agreements
Net Amounts Presented in Balance Sheet	28,917	27,285
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	27,915	26,434
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	1,002	851
Total Financial Liabilities
Gross Amounts of Recognized Assets/Liabilities	37,143	39,695
Gross Amounts Offset in Balance Sheet	7,878	11,928
Net Amounts Presented in Balance Sheet	29,265	27,767
Gross Amount Not Offset in Balance Sheet, Financial Instruments	28,029	26,503
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	1	0
Net Amount	$ 1,235	$ 1,264

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