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Debt Senior Notes (Details) (USD $)
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0 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 0 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | ||||||
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May 17, 2011
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
Notes Payable, Other Payables [Member]
Senior Notes, 5.875% Due 2019 [Member]
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Dec. 31, 2013
Notes Payable, Other Payables [Member]
Senior Notes, 5.875% Due 2019 [Member]
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May 17, 2011
Notes Payable, Other Payables [Member]
Senior Notes, 5.875% Due 2019 [Member]
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Jun. 30, 2014
Notes Payable, Other Payables [Member]
Senior Notes, 6.125% Due 2021 [Member]
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Dec. 31, 2013
Notes Payable, Other Payables [Member]
Senior Notes, 6.125% Due 2021 [Member]
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May 17, 2011
Notes Payable, Other Payables [Member]
Senior Notes, 6.125% Due 2021 [Member]
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Feb. 14, 2013
Notes Payable, Other Payables [Member]
Senior Notes, 5.000% Due 2023 [Member]
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Jun. 30, 2014
Notes Payable, Other Payables [Member]
Senior Notes, 5.000% Due 2023 [Member]
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Dec. 31, 2013
Notes Payable, Other Payables [Member]
Senior Notes, 5.000% Due 2023 [Member]
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Jun. 30, 2014
Notes Payable, Other Payables [Member]
Senior Notes, 4.150% Due 2024 [Member]
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Mar. 03, 2014
Notes Payable, Other Payables [Member]
Senior Notes, 4.150% Due 2024 [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||
| Senior notes issued | $ 500,000,000 | $ 800,000,000 | $ 700,000,000 | |||||||||||||
| Senior Notes Interest Rate at Period End | 5.875% | 5.875% | 6.125% | 6.125% | 6.125% | 5.00% | 5.00% | 5.00% | 4.15% | 4.15% | ||||||
| Debt Instrument, Maturity Date | May 15, 2019 | May 15, 2019 | May 15, 2021 | May 15, 2021 | Feb. 15, 2023 | Feb. 15, 2023 | Mar. 15, 2024 | |||||||||
| Loss on extinguishment of debt | 0 | 0 | (34,000,000) | (39,000,000) | (33,000,000) | |||||||||||
| Payments of Debt Issuance Costs | 23,000,000 | 12,000,000 | 6,000,000 | |||||||||||||
| Senior Notes Net Proceeds | $ 1,000,000,000 | |||||||||||||||
| Debt Instrument, Price | 99.649% | |||||||||||||||
| Debt Instrument, Interest Rate, Effective Percentage | 4.193% | |||||||||||||||