Borrowed Funds (Bank Notes, Senior Debt and Subordinated Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Borrowed Funds	$ 56,768us-gaap_DebtAndCapitalLeaseObligations	$ 46,105us-gaap_DebtAndCapitalLeaseObligations
Bank notes and senior debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	15,750
Subordinated debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	9,151
Bank notes [Member] \| Bank notes and senior debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	8,574
Stated rate, minimum	0.00%
Stated rate, maximum	3.30%
Maturity start date	2015
Maturity end date	2043
Senior debt [Member] \| Bank notes and senior debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	7,176
Stated rate, minimum	2.70%
Stated rate, maximum	6.70%
Maturity start date	2015
Maturity end date	2022
Junior subordinated debt [Member] \| Subordinated debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	205
Stated rate, minimum	0.81%
Stated rate, maximum	0.81%
Maturity start date	2028
Maturity end date	2028
Other subordinated debt [Member] \| Subordinated debt [Member]
Debt Instrument [Line Items]
Borrowed Funds	$ 8,946
Stated rate, minimum	0.61%
Stated rate, maximum	6.88%
Maturity start date	2015
Maturity end date	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 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: 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

+ 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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_
Data Type:	num:percentItemType
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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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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Data Type:	num:percentItemType
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Period Type:	duration

- Details

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- Details

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- Details

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- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_SeniorNotesMember
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- Details

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Namespace Prefix:
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- Details

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