INCOME TAXES - Deferred Tax Assets by Jurisdiction (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets by Jurisdiction
Net deferred tax assets	$ 22,903	$ 22,481
U.S. federal
Deferred Tax Assets by Jurisdiction
Net operating losses (NOLs)	2,600	2,300
Foreign tax credits (FTCs)	6,800	7,600
General business credits (GBCs)	1,000	1,400
Future tax deductions and credits	6,700	4,800
Net deferred tax assets	17,100	16,100
Deferred tax liability to be reversed in carry forward period	2,800
State and Local
Deferred Tax Assets by Jurisdiction
Future tax deductions and credits	1,400	1,300
Net deferred tax assets	3,600	3,800
New York
Deferred Tax Assets by Jurisdiction
Net operating losses (NOLs)	2,000	2,300
Other state
Deferred Tax Assets by Jurisdiction
Net operating losses (NOLs)	200	200
Foreign
Deferred Tax Assets by Jurisdiction
Net operating losses (NOLs)	600	600
Future tax deductions and credits	1,600	2,000
Net deferred tax assets	$ 2,200	$ 2,600