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Stockholders' Equity Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance $ 22,525  
Net current period other comprehensive income (loss) (39) $ 50
Ending Balance 22,067  
Foreign Currency Translation    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 53 47
Net unrealized gain (loss) (39) 21
Reclassifications to net income 0 0
Net current period other comprehensive income (loss) (39) 21
Ending Balance 14 68
Unrealized Gains and Losses on Available-for-Sale Securities    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 1 (52)
Net unrealized gain (loss) (23) 30
Reclassifications to net income (11) 0
Net current period other comprehensive income (loss) (34) 30
Ending Balance (33) (22)
Unrealized Gains and Losses on Cash Flow Hedges    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 31 85
Net unrealized gain (loss) 57 28
Reclassifications to net income (23) (29)
Net current period other comprehensive income (loss) 34 (1)
Ending Balance 65 84
AOCI Attributable to Parent    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 85 80
Net unrealized gain (loss) (5) 79
Reclassifications to net income (34) (29)
Net current period other comprehensive income (loss) (39) 50
Ending Balance $ 46 $ 130