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STOCKHOLDERS' EQUITY - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 18,221 $ 22,650
Other comprehensive income (loss) 98 (39)
Ending balance 18,964 22,179
Total    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (60) 85
Net unrealized gain (loss) 76 (5)
Reclassifications to net income 22 (34)
Other comprehensive income (loss) 98 (39)
Ending balance 38 46
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) 10 (39)
Reclassifications to net income 0 0
Other comprehensive income (loss) 10 (39)
Ending balance 61 14
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) (2) (23)
Reclassifications to net income 0 (11)
Other comprehensive income (loss) (2) (34)
Ending balance 0 (33)
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) 68 57
Reclassifications to net income 22 (23)
Other comprehensive income (loss) 90 34
Ending balance $ (23) $ 65