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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance $ 18,221 $ 22,650 $ 21,534
Other comprehensive income (loss) 143 (145) 5
Ending balance 21,064 18,221 22,650
Total      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (60) 85 80
Net unrealized gain 85 (62) 132
Reclassifications to net income 58 (83) (127)
Other comprehensive income (loss) 143 (145) 5
Ending balance 83 (60) 85
Foreign Currency Translation, Net of Tax      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 51 53 47
Net unrealized gain (38) (2) 6
Reclassifications to net income 0 0 0
Other comprehensive income (loss) (38) (2) 6
Ending balance 13 51 53
Unrealized Gains and Losses on Available-for-Sale Debt Securities, Net of Tax      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance 2 1 (52)
Net unrealized gain (6) 43 54
Reclassifications to net income 0 (42) (1)
Other comprehensive income (loss) (6) 1 53
Ending balance (4) 2 1
Unrealized Gains and Losses on Cash Flow Hedges, Net of Tax      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning balance (113) 31 85
Net unrealized gain 129 (103) 72
Reclassifications to net income 58 (41) (126)
Other comprehensive income (loss) 187 (144) (54)
Ending balance $ 74 $ (113) $ 31