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INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
INCOME TAXES (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Earnings Before Income Taxes	$ 2,167	$ 1,183	$ 4,463	$ 4,433
Income Tax Expense (Benefit)	$ 255	$ 327	$ 674	$ 1,129	$ 2,900
Effective Income Tax Rate Reconciliation, Percent	11.80%	27.60%	15.10%	25.50%
Federal statutory tax rate			21.00%	35.00%
Increase in Effective Income Tax Rate due to Discrete Items	1.50%	4.70%	0.80%	3.70%
Tax reserve release			49
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount					$ 2,600
Tax Adjustments, Settlements, and Unusual Provisions			$ 49
Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 305		305
Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 355		$ 355