SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Summary of Significant Accounting Policies - PPE (Details) - USD ($) $ in Millions	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 3,338	$ 3,456	$ 3,428	$ 3,403	$ 3,395	$ 3,360	$ 3,331	$ 3,316
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	286	342	319	292	269	243	215	192
Net property, plant and equipment	$ 3,052	$ 3,114	$ 3,109	$ 3,111	$ 3,126	$ 3,117	$ 3,116	$ 3,124