INCOME TAXES - Deferred Tax Assets by Jurisdiction (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets by Jurisdiction
Net deferred tax assets	$ 23,094	$ 22,903
U.S. federal
Deferred Tax Assets by Jurisdiction
Net operating losses (NOLs)	2,800	2,600
Foreign tax credits (FTCs)	6,300	6,800
General business credits (GBCs)	2,500	1,000
Future tax deductions and credits	6,200	6,700
Net deferred tax assets	17,800	17,100
Deferred tax liability to be reversed in carry forward period	3,400
State and Local
Deferred Tax Assets by Jurisdiction
Future tax deductions and credits	1,300	1,400
Net deferred tax assets	3,200	3,600
New York
Deferred Tax Assets by Jurisdiction
Net operating losses (NOLs)	1,700	2,000
Other state
Deferred Tax Assets by Jurisdiction
Net operating losses (NOLs)	200	200
Foreign
Deferred Tax Assets by Jurisdiction
Net operating losses (NOLs)	500	600
Future tax deductions and credits	1,600	1,600
Net deferred tax assets	$ 2,100	$ 2,200