INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized tax benefits that, if recognized, would impact the effective tax rate	$ 498	$ 497	$ 385
Amount of unrecognized tax benefits that is reasonably possible will be reversed in next twelve months	207
Interest related to unrecognized tax benefits	28	3	$ 24
Tax credits which expire	24
Tax credits which do not expire	16
Net operating loss benefits	10	$ 10
Net operating losses	3,319
Net operating losses subject to expiration	$ 1,951
Income tax benefit from non-U.S. income	(3.30%)	(1.00%)	(7.30%)
Pre-tax income	$ 1,050	$ 1,034	$ 829
Income tax expense (benefit)	20.40%	18.70%	51.10%
Cash paid for income taxes	$ 526	$ 678	$ 636
2017 Tax Act, provisional income tax expense (benefit)			(153)
2017 Tax Act, transition tax expense (benefit)			$ 745
2017 Tax Act, income tax expense (benefit)		$ (41)
U.S. Issues Currently in Appeals
Income Tax Contingency [Line Items]
Amount of unrecognized tax benefits that is reasonably possible will be reversed in next twelve months	179
State and Non-U.S. Audits Expected to be Resolved in 2020
Income Tax Contingency [Line Items]
Amount of unrecognized tax benefits that is reasonably possible will be reversed in next twelve months	$ 28
Switzerland, Singapore, and Luxembourg
Income Tax Contingency [Line Items]
Income tax benefit from non-U.S. income	8.00%	3.40%	6.20%
Pre-tax income	$ 642	$ 432	$ 576
State
Income Tax Contingency [Line Items]
Charge for unremitted foreign earnings		$ 29
International | United States
Income Tax Contingency [Line Items]
Income tax expense (benefit)	2.00%	1.40%