DEBT (Retirement of Debt) (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended			12 Months Ended
	Mar. 31, 2016	Apr. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Other Nonoperating (Income) Expense [Member]
Debt Instrument [Line Items]
Losses on extinguishment of debt				$ 48	$ 144
6.95% Senior Notes due July 2037 and 5.75% Senior Notes due January 2040 [Member]
Debt Instrument [Line Items]
Extinguishment of debt, amount	$ 200		$ 250
6.95% Senior Notes Due 2037 [Member]
Debt Instrument [Line Items]
Extinguishment of debt, amount	$ 73		176
Debt instrument, interest rate	6.95%					6.95%
5.75% Senior Notes Due 2040 [Member]
Debt Instrument [Line Items]
Extinguishment of debt, amount	$ 127		$ 74
Debt instrument, interest rate	5.75%					5.75%
5.45% Senior Notes Due 2015 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		5.45%
3.20% Senior Notes Due 2016 [Member]
Debt Instrument [Line Items]
Extinguishment of debt, amount		$ 150
Debt instrument, interest rate		3.20%
6.40% Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		6.40%