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SENIOR NOTES PAYABLE AND OTHER DEBT - Senior Notes (Details) $ in Thousands, $ in Billions	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2019 CAD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Aug. 31, 2019 USD ($)	Jul. 01, 2019 USD ($)	Feb. 28, 2019 USD ($)	Jan. 03, 2019 USD ($)
Debt instruments
Loss on extinguishment of debt, net		$ 37,434		$ 39,527	$ 41,861	$ 50,411
5.45% Senior Notes due 2043
Debt instruments
Senior notes redeemed											$ 258,800
Interest rate		5.45%			5.45%						5.45%
Loss on extinguishment of debt, net			$ 400				$ 7,100
Senior notes		$ 0			$ 0		258,750
3.50% Senior Notes due 2024
Debt instruments
Interest rate		3.50%			3.50%					3.50%
Senior notes		$ 400,000			$ 400,000		0			$ 400,000
Public offering price as percent of par										99.88%
4.875% Senior Notes due 2049
Debt instruments
Interest rate		4.875%			4.875%					4.875%
Senior notes		$ 300,000			$ 300,000		0			$ 300,000
Public offering price as percent of par										99.77%
2.65% Senior Notes due 2025
Debt instruments
Interest rate		2.65%			2.65%				2.65%
Senior notes		$ 450,000			$ 450,000		0		$ 450,000
Public offering price as percent of par									99.45%
2.70% Senior Notes due 2020
Debt instruments
Senior notes redeemed								$ 102,900	$ 397,100
Interest rate		2.70%			2.70%			2.70%	2.70%
Loss on extinguishment of debt, net					$ 2,400
Senior notes		$ 0			$ 0		500,000
Public offering price as percent of par									100.37%
3.00% Senior Notes due 2030
Debt instruments
Interest rate		3.00%			3.00%			3.00%
Senior notes		$ 650,000			$ 650,000		0	$ 650,000
Public offering price as percent of par								99.51%
4.25% Senior Notes due 2022
Debt instruments
Senior notes redeemed		$ 204,300			$ 204,300			$ 395,700
Interest rate		4.25%			4.25%			4.25%
Loss on extinguishment of debt, net		$ 35,800
Senior notes		$ 0			$ 0		600,000
Public offering price as percent of par								105.46%
3.00% Senior Notes, Series A due 2019
Debt instruments
Interest rate		3.00%			3.00%
Senior notes		$ 0			$ 0		$ 293,319
Repayments of debt	$ 0.4