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ACCOUNTING AND DISCLOSURE CHANGES - NARRATIVE (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cash and restricted cash |  | $ 3,033 | $ 1,672 | $ 2,233 |  | $ 4,394
Cash flows from investing activities |  | (3,206) | (3,079) | (4,743) |  |
Cash flows from operating activities |  | $ 7,669 | 4,861 | 3,384 |  |
Accounting Standards Update 2018-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification of stranded tax effects | $ 58 |  |  |  |  |
Accounting Standards Update 2016-02 | Forecast | Subsequent Event | Low end of range |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Right-of-use asset |  |  |  |  | $ 800 |
Lease liability |  |  |  |  | 800 |
Accounting Standards Update 2016-02 | Forecast | Subsequent Event | High end of range |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Right-of-use asset |  |  |  |  | 1,000 |
Lease liability |  |  |  |  | $ 1,000 |
Accounting Standards Update 2016-18 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cash and restricted cash |  |  |  | 1,200 |  | $ 4,400
Cash flows from financing activities |  |  |  | $ (1,200) |  |
Accounting Standards Update 2016-15 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Cash flows from investing activities |  |  | 135 |  |  |
Cash flows from operating activities |  |  | $ (135) |  |  |

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