BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 96,921		$ 93,109
Right-of-use assets	4,016		0
Lease liabilities	$ 4,180		$ 0
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 317
Right-of-use assets		4,016
Lease liabilities		4,180
ASU 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		52
Borrowings		$ (52)