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LONG-TERM DEBT - CREDIT FACILITY (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2016 | Jun. 30, 2016 | May 31, 2016 | Apr. 30, 2016 | Feb. 29, 2016 | Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Long-term debt |  |  |  |  |  |  |  |
Net proceeds from issuance of long-term debt |  |  |  |  |  |  | $ 4,203.0 | $ 1,478.0
Credit Facility |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Credit Facility, maximum borrowing capacity |  |  |  |  |  |  | $ 2,000.0 |
Average annual facility fee as percent of the total commitment amounts |  |  |  |  |  |  | 0.08% |
Letter of Credit |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Credit Facility, maximum borrowing capacity |  |  |  |  |  |  | $ 1,000.0 |
Senior notes |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Debt instrument issued | $ 1,500.0 |  |  | $ 2,750.0 |  | $ 1,500.0 |  |
Net proceeds from issuance of long-term debt | 1,490.0 |  |  | 2,720.0 |  | $ 1,480.0 |  |
3.00% senior notes due 2027 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Debt instrument issued | $ 750.0 |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 3.00% |  |  |  |  |  | 3.00% |
4.10% senior notes due 2047 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Debt instrument issued | $ 750.0 |  |  |  |  |  |  |
Debt instrument interest rate stated percentage | 4.10% |  |  |  |  |  | 4.10% |
1.75% senior notes due 2017 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  | 1.75% |  |  |  |  | 1.75%
Early repayment of debt through exercise of redemption option |  |  | $ 1,250.0 |  |  |  |  |
4.125% senior notes due 2016 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  | 4.125% |  |  |  |  |  | 4.125%
Retired debt |  | $ 750.0 |  |  |  |  |  |
2.60% senior notes due 2022 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  | $ 400.0 |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 2.60% |  |  | 2.60% |
3.40% senior notes due 2026 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  | $ 1,150.0 |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 3.40% |  |  | 3.40% |
4.40% senior notes due 2046 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Debt instrument issued |  |  |  | $ 1,200.0 |  |  |  |
Debt instrument interest rate stated percentage |  |  |  | 4.40% |  |  | 4.40% |
2.50% senior notes due 2016 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  | 2.50% |  |  | 2.50%
Repaid of matured senior notes |  |  |  |  | $ 700.0 |  |  |
Dolphin Energy |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Notional amount of limited recourse guarantees with respect to Dolphin Energy's debt |  |  |  |  |  |  | $ 296.0 | $ 318.0

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