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MERGER AND PARTNERSHIP AGREEMENTS - Partnership Agreement (Details) - USD ($) shares in Millions, $ in Millions |  |  | 3 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
May 29, 2018 | May 17, 2018 | Aug. 18, 2018 | May 26, 2018 | Aug. 18, 2018
Arrangement |  |  |  |  |
Unrealized gain on equity securities |  |  | $ 216 |  | $ 252
Ocado |  |  |  |  |
Arrangement |  |  |  |  |
Unrealized gain on equity securities |  |  |  |  | 252
Realized gain on equity securities |  |  |  |  | 0
Ocado | Other Assets |  |  |  |  |
Arrangement |  |  |  |  |
Fair value of equity securities |  |  | $ 645 |  | $ 645
Partnership Framework Agreement | Ocado |  |  |  |  |
Arrangement |  |  |  |  |
Exclusivity fee and letter of credit |  | $ 180 |  |  |
Share Subscription Agreement | Ocado |  |  |  |  |
Arrangement |  |  |  |  |
Number of ordinary shares to be purchased |  | 33.1 |  |  |
Aggregate purchase price |  | $ 243 |  |  |
Number of ordinary shares purchased | 33.1 |  | 6.5 | 8.1 |

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