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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. 02, 2019
Nov. 10, 2018
Aug. 18, 2018
May 26, 2018
Feb. 02, 2019
Arrangement              
Unrealized (loss) gain on equity securities     $ 75 $ (100) $ 216 $ 36 $ 228
Ocado              
Arrangement              
Unrealized (loss) gain on equity securities             228
Realized gain on equity securities             0
Ocado | Other Assets              
Arrangement              
Fair value of equity securities     $ 620       $ 620
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 33.0       6.5 8.1