Derivative Instruments (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivatives
Gross Amounts of Recognized Financial Instruments	$ 10,807	$ 13,088
Securities purchased under agreement to resell
Gross Amounts of Recognized Financial Instruments	240	1,016
Gross Amounts Offset in the Statements of Financial Position	0	0
Net Amounts Presented in the Statements of Financial Position	240	1,016
Financial Instruments/Collateral	(240)	(1,016)
Net Amount	0	0
Total Assets
Gross Amounts of Recognized Financial Instruments	10,950	14,003
Gross Amounts Offset in the Statements of Financial Position	(9,600)	(11,716)
Net Amounts Presented in the Statements of Financial Position	1,350	2,287
Financial Instruments/Collateral	(865)	(1,415)
Net Amount	485	872
Derivatives
Gross Amounts of Recognized Financial Instruments	5,955	6,290
Securities sold under agreement to repurchase
Gross Amounts of Recognized Financial Instruments	8,400	7,606
Gross Amounts Offset in the Statement of Financial Position	0	0
Net Amounts Presented in the Statement of Financial Position	8,400	7,606
Financial Instruments/Collateral	(8,400)	(7,606)
Net Amount	0	0
Total Liabilities
Gross Amounts of Recognized Financial Instruments	14,348	13,887
Gross Amounts Offset in the Statement of Financial Position	(5,312)	(5,945)
Net Amounts Presented in the Statement of Financial Position	9,036	7,942
Financial Instruments/Collateral	(8,988)	(7,905)
Net Amount	48	37
Counterparty
Derivatives
Gross Amounts of Recognized Financial Instruments	10,710	12,987
Gross Amounts Offset in the Statements of Financial Position	(9,600)	(11,716)
Net Amounts Presented in the Statements of Financial Position	1,110	1,271
Financial Instruments/Collateral	(625)	(399)
Net Amount	485	872
Derivatives
Gross Amounts of Recognized Financial Instruments	5,948	6,281
Gross Amounts Offset in the Statement of Financial Position	(5,312)	(5,945)
Net Amounts Presented in the Statement of Financial Position	636	336
Financial Instruments/Collateral	(588)	(299)
Net Amount	$ 48	$ 37

Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral

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Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Collateral

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value of securities pledged as collateral against derivative liabilities.

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-Subparagraph (SX 210.4-08.(m)(1)(a)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(1))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 45
-Paragraph 11
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