Financial Derivatives (Derivatives Designated As Hedging Instruments Under GAAP) (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative Asset, Fair Value	$ 7,147	$ 4,941
Derivative Liability, Fair Value	5,407	3,802
Derivative Notional Amount	348,787	347,976
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	1,645	1,159
Derivative Liability, Fair Value	309	174
Derivative Notional Amount	52,466	52,074
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	5,502	3,782
Derivative Liability, Fair Value	5,098	3,628
Derivative Notional Amount	296,321	295,902
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	990	712
Derivative Liability, Fair Value	308	171
Derivative Notional Amount	33,687	31,690
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Receive Fixed Swaps [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	989	699
Derivative Liability, Fair Value	1	18
Derivative Notional Amount	25,972	25,756
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Pay Fixed Swaps [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	1	13
Derivative Liability, Fair Value	307	153
Derivative Notional Amount	7,715	5,934
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	488	416
Derivative Liability, Fair Value	1	3
Derivative Notional Amount	17,779	19,279
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Receive Fixed Swaps [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	487	412
Derivative Liability, Fair Value	1	2
Derivative Notional Amount	17,579	17,879
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Forward Purchase Commitments [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	1	4
Derivative Liability, Fair Value		1
Derivative Notional Amount	200	1,400
Net Investment Hedging [Member] \| Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Asset, Fair Value	167	31
Derivative Notional Amount	$ 1,000	$ 1,105

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Fair value, before effects of master netting arrangements, of a 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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