Debt Obligations, Debt Maturities (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Scheduled Maturities of Debt [Abstract]
Remainder of 2016	$ 2,072.0
2017	800.0
2018	1,100.0
2019	1,500.0
2020	1,500.0
After 2020	15,974.4
Total	22,946.4	$ 22,738.5
Commercial Paper Notes [Member]
Scheduled Maturities of Debt [Abstract]
Remainder of 2016	2,072.0
2017	0.0
2018	0.0
2019	0.0
2020	0.0
After 2020	0.0
Total	2,072.0
Senior Notes [Member]
Scheduled Maturities of Debt [Abstract]
Remainder of 2016	0.0
2017	800.0
2018	1,100.0
2019	1,500.0
2020	1,500.0
After 2020	14,500.0
Total	19,400.0
Junior Subordinated Notes [Member]
Scheduled Maturities of Debt [Abstract]
Remainder of 2016	0.0
2017	0.0
2018	0.0
2019	0.0
2020	0.0
After 2020	1,474.4
Total	$ 1,474.4

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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