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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - RISKS AND UNCERTAINTIES (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
RISKS AND UNCERTAINTIES |  |  |
Assets | $ 43,854 | $ 42,026 | $ 43,109
Net sales | 17,824 | $ 12,508 | $ 10,090
Outside North America |  |  |
RISKS AND UNCERTAINTIES |  |  |
Assets | 8,900 |  |
Net sales | $ 5,300 |  |

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