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Debt Notes (Details) (USD $) | 6 Months Ended |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013 | Mar. 31, 2013 Term Loan [Member] | Jun. 30, 2014 2.375% Notes [Member] | Jun. 30, 2014 4.50% Notes [Member] | Jun. 30, 2014 Unsecured Debt [Member]
Debt Instrument [Line Items] |  |  |  |  |  |
Notes, net | $ 5,923,952,000 | $ 5,477,088,000 |  |  |  |
Term Loan Principal Amount |  |  | 750,000,000 |  |  |
Proceeds from Issuance of Unsecured Debt |  |  |  | 450,000,000 | 750,000,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.375% | 4.50% |
Proceeds from Debt, Net of Issuance Costs |  |  |  | $ 449,600,000 | $ 744,700,000 |
Debt Instrument, Interest Rate, Effective Percentage Rate Range, Maximum |  |  |  | 2.52% | 4.57% |
Debt Instrument, Maturity Date Range, End | Dec. 31, 2044 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 0.03% |  |  |  |  | 2.375%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum | 7.25% |  |  |  |  | 7.57%
Weighted Average Interest Rate | 4.97% |  |  |  |  |

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