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GOODWILL AND OTHER INTANGIBLE ASSETS - Other Intangible Assets by Major Class (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Summary of other intangible assets |  |
Intangible assets not subject to amortization | $ 1,374 | $ 1,382
Intangible assets subject to amortization |  |
Historical cost | 7,747 | 5,904
Accumulated amortization | 3,266 | 3,111
Customer relationships |  |
Intangible assets subject to amortization |  |
Historical cost | 4,752 | 3,415
Accumulated amortization | 1,974 | 1,795
Patents and technology |  |
Intangible assets subject to amortization |  |
Historical cost | 1,879 | 1,428
Accumulated amortization | 712 | 773
Trademarks |  |
Intangible assets subject to amortization |  |
Historical cost | 951 | 970
Accumulated amortization | 518 | 505
Other |  |
Intangible assets subject to amortization |  |
Historical cost | 165 | 91
Accumulated amortization | $ 62 | $ 38

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