Securities Financing Arrangements - Schedule of Offsetting Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Derivative assets
Gross Amounts of Recognized Assets	$ 807	$ 1,322
Gross Amounts Offset in Balance Sheet	331	607
Net Amounts Presented in Balance Sheet	476	715
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	14	25
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	462	690
Securities borrowed or purchased under resale agreements
Gross Amounts of Recognized Assets	32,723	31,845
Gross Amounts Offset in Balance Sheet	12,675	10,951
Net Amounts Presented in Balance Sheet	20,048	20,894
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	19,953	20,816
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	95	78
Total Financial Assets
Gross Amounts of Recognized Assets	33,530	33,167
Gross Amounts Offset in Balance Sheet	13,006	11,558
Net Amounts Presented in Balance Sheet	20,524	21,609
Gross Amounts Not Offset In Balance Sheet, Financial Instruments	19,967	20,841
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	557	768
Derivative liabilities
Gross Amounts of Recognized Liabilities	934	1,127
Gross Amounts Offset in Balance Sheet	336	620
Net Amounts Presented in Balance Sheet	598	507
Gross Amount Not Offset in Balance Sheet, Financial Instruments	86	142
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	512	365
Securities loaned or sold under repurchase agreements
Gross Amounts of Recognized Assets/Liabilities	38,254	37,388
Gross Amounts Offset in Balance Sheet	12,675	10,951
Net Amounts Presented in Balance Sheet	25,579	26,437
Gross Amounts Not Offset in Balance Sheet, Financial Instruments	24,773	25,639
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	806	798
Total Financial Liabilities
Gross Amounts of Recognized Assets/Liabilities	39,188	38,515
Gross Amounts Offset in Balance Sheet	13,011	11,571
Net Amounts Presented in Balance Sheet	26,177	26,944
Gross Amount Not Offset in Balance Sheet, Financial Instruments	24,859	25,781
Gross Amounts Not Offset in Balance Sheet, Cash Collateral Received/Pledged	0	0
Net Amount	$ 1,318	$ 1,163

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