DEBT - Schedule of Long-term Debt Outstanding (Details) (USD $)			1 Months Ended	9 Months Ended																					1 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Senior Notes	Sep. 30, 2014 Senior Notes	Dec. 31, 2013 Senior Notes	Dec. 31, 2008 Senior Notes	Sep. 30, 2014 Senior Notes $500 million, 6.45% due June 1, 2016	Dec. 31, 2013 Senior Notes $500 million, 6.45% due June 1, 2016	Sep. 30, 2014 Senior Notes $500 million, 7.20% due June 15, 2018	Dec. 31, 2013 Senior Notes $500 million, 7.20% due June 15, 2018	Sep. 30, 2014 Senior Notes $300 million, 6.30% due August 1, 2018	Dec. 31, 2013 Senior Notes $300 million, 6.30% due August 1, 2018	Sep. 30, 2014 Senior Notes $400 million, 2.625% due October 1, 2019	Dec. 31, 2013 Senior Notes $400 million, 2.625% due October 1, 2019	Sep. 30, 2014 Senior Notes $600 million, 3.15% due December 1, 2022	Dec. 31, 2013 Senior Notes $600 million, 3.15% due December 1, 2022	Sep. 30, 2014 Senior Notes $600 million, 3.85% due October 1, 2024	Dec. 31, 2013 Senior Notes $600 million, 3.85% due October 1, 2024	Sep. 30, 2014 Senior Notes $250 million, 8.15% due June 15, 2038	Dec. 31, 2013 Senior Notes $250 million, 8.15% due June 15, 2038	Sep. 30, 2014 Senior Notes $400 million, 4.625% due December 1, 2042	Dec. 31, 2013 Senior Notes $400 million, 4.625% due December 1, 2042	Sep. 30, 2014 Senior Notes $750 million, 4.95% due October 1, 2044	Dec. 31, 2013 Senior Notes $750 million, 4.95% due October 1, 2044	Oct. 31, 2014 Subsequent Event Senior Notes $500 million, 6.45% due June 1, 2016
Debt Instrument [Line Items]
Stated interest rate							6.45%	6.45%	7.20%	7.20%	6.30%	6.30%	2.625%	0.00%	3.15%	3.15%	3.85%	0.00%	8.15%	8.15%	4.625%	4.625%	4.95%	0.00%
Face amount							$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 300,000,000	$ 300,000,000	$ 400,000,000	$ 0	$ 600,000,000	$ 600,000,000	$ 600,000,000	$ 0	$ 250,000,000	$ 250,000,000	$ 400,000,000	$ 400,000,000	$ 750,000,000	$ 0
Total debt	4,338,000,000	2,600,000,000	4,338,000,000	4,338,000,000	2,600,000,000		512,000,000	517,000,000	505,000,000	505,000,000	312,000,000	314,000,000	400,000,000	0	598,000,000	598,000,000	599,000,000	0	266,000,000	266,000,000	400,000,000	400,000,000	746,000,000	0
Less current portion of long-term debt	512,000,000	0	512,000,000	512,000,000	0
Total long-term debt			3,826,000,000	3,826,000,000	2,600,000,000
Proceeds from issuance of debt, net of underwriters' discount and commission and offering expenses			1,730,000,000
Redemption price, percentage				100.00%																					100.00%
Extinguishment of debt, amount																									560,000,000
Loss on extinguishment of debt																									37,000,000
Unamortized discount (premium)			$ 45,000,000	$ 45,000,000	$ 54,000,000	$ 103,000,000																			$ 12,000,000