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MERGER AND PARTNERSHIP AGREEMENTS - PARTNERSHIP AGREEMENT (Details) - USD ($) shares in Millions, $ in Millions |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 29, 2018 | May 17, 2018 | Feb. 01, 2020 | Nov. 09, 2019 | Aug. 17, 2019 | Feb. 02, 2019 | Nov. 10, 2018 | Aug. 18, 2018 | May 25, 2019 | May 26, 2018 | Feb. 01, 2020 | Feb. 02, 2019
Agreement and commitments |  |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain on equity securities |  |  | $ (9) | $ 106 | $ (45) | $ 75 | $ (100) | $ 216 | $ 106 | $ 36 | $ 157 | $ 228
Ocado |  |  |  |  |  |  |  |  |  |  |  |
Agreement and commitments |  |  |  |  |  |  |  |  |  |  |  |
Unrealized (loss) gain on equity securities |  |  |  |  |  |  |  |  |  |  | 157 | 228
Realized gain on equity securities |  |  |  |  |  |  |  |  |  |  | 0 | 0
Ocado | Other Assets |  |  |  |  |  |  |  |  |  |  |  |
Agreement and commitments |  |  |  |  |  |  |  |  |  |  |  |
Fair value of equity securities |  |  | $ 776 |  |  | $ 620 |  |  |  |  | $ 776 | $ 620
Partnership Framework Agreement | Ocado |  |  |  |  |  |  |  |  |  |  |  |
Agreement and commitments |  |  |  |  |  |  |  |  |  |  |  |
Letter of credit |  | $ 180 |  |  |  |  |  |  |  |  |  |
Share Subscription Agreement | Ocado |  |  |  |  |  |  |  |  |  |  |  |
Agreement and commitments |  |  |  |  |  |  |  |  |  |  |  |
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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