Securities Financing Arrangements - Schedule of Offsetting Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivative assets
Gross Amounts of Recognized Assets	$ 1,025	$ 871
Gross Amounts Offset in Balance Sheet	351	354
Net Amounts Presented in Balance Sheet	674	517
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	17	14
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	657	503
Securities borrowed or purchased under resale agreements
Gross Amounts of Recognized Assets	32,114	33,974
Gross Amounts Offset in Balance Sheet	9,254	11,606
Net Amounts Presented in Balance Sheet	22,860	22,368
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	22,769	22,291
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	91	77
Total Financial Assets
Gross Amounts of Recognized Assets	33,139	34,845
Gross Amounts Offset in Balance Sheet	9,605	11,960
Net Amounts Presented in Balance Sheet	23,534	22,885
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	22,786	22,305
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	748	580
Derivative liabilities
Gross Amounts of Recognized Liabilities	705	804
Gross Amounts Offset in Balance Sheet	323	322
Net Amounts Presented in Balance Sheet	382	482
Gross Amount Not Offset in Balance Sheet, Financial Instruments	89	69
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	1	0
Net Amount	292	413
Securities loaned or sold under repurchase agreements
Gross Amounts of Recognized Assets/Liabilities	36,679	38,891
Gross Amounts Offset in Balance Sheet	9,254	11,606
Net Amounts Presented in Balance Sheet	27,425	27,285
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	26,594	26,434
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	831	851
Total Financial Liabilities
Gross Amounts of Recognized Assets/Liabilities	37,384	39,695
Gross Amounts Offset in Balance Sheet	9,577	11,928
Net Amounts Presented in Balance Sheet	27,807	27,767
Gross Amount Not Offset in Balance Sheet, Financial Instruments	26,683	26,503
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	1	0
Net Amount	$ 1,123	$ 1,264

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

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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 asset associated with funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price.

+ References

+ Details

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

- Definition

Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

+ Details

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