Stockholder's Equity (Details 5) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Summary of dividend payments
Dividends declared and paid per common share	$ 0.825	$ 0.795
Common stock cash dividends	$ 272,569,000us-gaap_PaymentsOfDividendsCommonStock	$ 230,801,000us-gaap_PaymentsOfDividendsCommonStock
Total dividends paid	288,921,000us-gaap_PaymentsOfOrdinaryDividends	247,154,000us-gaap_PaymentsOfOrdinaryDividends
Series H Preferred Stock [Member]
Summary of dividend payments
Dividends declared and paid per preferred share		$ 0.0079
Preferred stock cash dividends		1,000
Series I Preferred Stock [Member]
Summary of dividend payments
Dividends declared and paid per preferred share	$ 0.8125	$ 0.8125
Preferred stock cash dividends	11,680,000	11,680,000
Series J Preferred Stock [Member]
Summary of dividend payments
Dividends declared and paid per preferred share	$ 0.4064	$ 0.4064
Preferred stock cash dividends	$ 4,672,000	$ 4,672,000

Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

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