OPERATING SEGMENTS - Assets by Geographic Area (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Assets	$ 198,874	$ 256,211
Continuing operations
Segment Reporting Information [Line Items]
Assets	195,697	215,463	$ 224,562
Continuing operations | U.S.
Segment Reporting Information [Line Items]
Assets	130,956	139,768
Continuing operations | Total Non-U.S.
Segment Reporting Information [Line Items]
Assets	64,741	75,695
Continuing operations | Europe
Segment Reporting Information [Line Items]
Assets	42,213	50,121
Continuing operations | Asia
Segment Reporting Information [Line Items]
Assets	11,534	12,974
Continuing operations | Americas
Segment Reporting Information [Line Items]
Assets	6,406	7,084
Continuing operations | Other Global
Segment Reporting Information [Line Items]
Assets	$ 4,588	$ 5,516