Debt (Junior Subordinated Notes) (Details)	12 Months Ended
Dec. 31, 2016 USD ($) entity	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Long-term Debt	$ 27,716,999,000	$ 29,641,863,000
Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	1,555,548,000	1,564,045,000
Junior Subordinated Notes [Member] \| Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	500,000,000	$ 500,000,000
Face amount	$ 500,000,000
Debt, fixed interest rate	6.50%
Applicable Margin	4.30%
Deferral of interest payments, maximum term	5 years
Junior Subordinated Notes [Member] \| Subordinated Debt [Member] \| Debt Instrument, Redemption, Option (i) [Member]
Debt Instrument [Line Items]
Redemption price of debt instrument, percentage	100.00%
Junior Subordinated Notes [Member] \| Subordinated Debt [Member] \| Debt Instrument, Redemption, Option (iii) [Member]
Debt Instrument [Line Items]
Redemption price of debt instrument, percentage	100.00%
Junior Subordinated Notes [Member] \| Subordinated Debt [Member] \| Debt Instrument, Redemption, Option (iv) [Member]
Debt Instrument [Line Items]
Redemption price of debt instrument, percentage	101.00%
Days after occurence	60 days
Number Of Applicable Rating Agencies \| entity	2
Annual interest rate increase	5.00%
Revolving Credit Facility Before Issuance Of Junior Subondinated Notes [Member]
Debt Instrument [Line Items]
Credit facility, current borrowing capacity	$ 1,000,000,000
Revolving Credit Facility After Issuance Of Junior Subondinated Notes [Member]
Debt Instrument [Line Items]
Credit facility, current borrowing capacity	$ 500,000,000

Debt Instrument, Change Of Control Triggering Event, Term To Redemption, Maximum

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- Definition

Deferral Of Interest Payments, Term

+ References

No definition available.

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- Definition

Number Of Applicable Rating Agencies

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Section 45
-Paragraph 2
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- Definition

Incremental percentage increase (decrease) in the stated rate on a debt instrument.

+ References

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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.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes 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(a)(16))
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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
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