Borrowed Funds (FHLB Borrowings, Bank Notes, Senior Debt and Subordinated Debt) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Borrowed Funds	$ 54,532	$ 56,768
Bank notes and senior debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	21,298
Subordinated debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	8,556
FHLB [Member]
Debt Instrument [Line Items]
Borrowed Funds	$ 20,108
Stated rate - minimum	0.00%
Stated rate - maximum	6.50%
Maturity dates range - minimum	2016
Maturity dates range - maximum	2030
Bank notes [Member] \| Bank notes and senior debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	$ 16,033
Stated rate - minimum	0.00%
Stated rate - maximum	3.30%
Maturity dates range - minimum	2016
Maturity dates range - maximum	2043
Senior debt [Member] \| Bank notes and senior debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	$ 5,265
Stated rate - minimum	2.70%
Stated rate - maximum	6.70%
Maturity dates range - minimum	2016
Maturity dates range - maximum	2022
Junior subordinated debt [Member] \| Subordinated debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	$ 205
Stated rate - minimum	0.98%
Stated rate - maximum	0.98%
Maturity dates range - minimum	2028
Maturity dates range - maximum	2028
Other subordinated debt [Member] \| Subordinated debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	$ 8,351
Stated rate - minimum	0.82%
Stated rate - maximum	6.88%
Maturity dates range - minimum	2016
Maturity dates range - maximum	2025

The latest date when the outstanding debt instruments are required to be repaid, in CCYY format.

No definition available.

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- Definition

The earliest date when the outstanding debt instruments are required to be repaid, in CCYY format.

+ References

No definition available.

+ Details

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Minimum contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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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.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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