NOTES PAYABLE, LONG-TERM DEBT AND AVAILABLE CREDIT FACILITIES NOTES PAYABLE, LONG-TERM DEBT AND AVAILABLE CREDIT FACILITIES (Schedule of Committed and Available Credit Facilities) (Details) $ in Millions	Sep. 30, 2016 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 10,880
Line of Credit Facility, Remaining Borrowing Capacity	6,380
$200M Revolving Credit Facility Due 7/2018 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200
Line of Credit Facility, Remaining Borrowing Capacity	200
Five Year Competitive Advance and Revolving Credit Facility Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	5,000
Line of Credit Facility, Remaining Borrowing Capacity	5,000
$100M Revolving Credit Facility Due 3/2017 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100
Line of Credit Facility, Remaining Borrowing Capacity	100
$100M Revolving Credit Facility Due 3/2020 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100
Line of Credit Facility, Remaining Borrowing Capacity	100
$280M Revolving Credit Facility Due 3/2020 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	280
Line of Credit Facility, Remaining Borrowing Capacity	280
$100M Revolving Credit Facility Due 3/2020 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100
Line of Credit Facility, Remaining Borrowing Capacity	100
$100M Revolving Credit Facility Due 3/2020 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100
Line of Credit Facility, Remaining Borrowing Capacity	100
$200M Revolving Credit Facility due 3/2020 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200
Line of Credit Facility, Remaining Borrowing Capacity	200
$200M Revolving Credit Facility Due 5/2018 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200
Line of Credit Facility, Remaining Borrowing Capacity	200
DCC Term Loan Facility [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	4,500
Line of Credit Facility, Remaining Borrowing Capacity	0	[1]
$100M Revolving Credit Facility Due 8/2018 [Domain]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100
Line of Credit Facility, Remaining Borrowing Capacity	$ 100

[1] Drawn on May 31, 2016, by Dow Corning, a wholly owned subsidiary of the Company as of June 1, 2016.