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STOCKHOLDERS' EQUITY - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 19,710 $ 18,142 $ 18,221 $ 22,650
Other comprehensive income (loss) 35 (47) 134 (62)
Ending balance 21,471 17,471 21,471 17,471
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 39 70 (60) 85
Net unrealized gain (loss)     74 5
Reclassifications to net income (loss)     60 (67)
Other comprehensive income (loss) 35 (47) 134 (62)
Ending balance 74 23 74 23
Foreign Currency Translation, Net of Tax        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     51 53
Net unrealized gain (loss)     (15) (12)
Reclassifications to net income (loss)     0 0
Other comprehensive income (loss)     (15) (12)
Ending balance 36 41 36 41
Unrealized Gains and Losses on Available-for-Sale Debt Securities, Net of Tax        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     2 1
Net unrealized gain (loss)     (3) 42
Reclassifications to net income (loss)     0 (17)
Other comprehensive income (loss)     (3) 25
Ending balance (1) 26 (1) 26
Unrealized Gains and Losses on Cash Flow Hedges, Net of Tax        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (113) 31
Net unrealized gain (loss)     92 (25)
Reclassifications to net income (loss)     60 (50)
Other comprehensive income (loss)     152 (75)
Ending balance $ 39 $ (44) $ 39 $ (44)