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Stockholders' Equity Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance $ 22,091 $ 20,651 $ 21,534 $ 20,501  
Net current period other comprehensive income (loss) (28) 172 22 130  
Ending Balance 22,751 21,734 22,751 21,734  
Foreign Currency Translation          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance     47 85  
Reclassifications to retained earnings as a result of the adoption of new accounting standards         $ 0
Balance at January 1, 2018         85
Net unrealized gain (loss) 8 (18)      
Reclassifications to net income 0 0      
Net current period other comprehensive income (loss) 8 (18)      
Ending Balance 55 67 55 67  
Unrealized Gains and Losses on Available-for-Sale Securities          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance     (52) 194  
Balance at January 1, 2018         (99)
Net unrealized gain (loss) 49 (6)      
Reclassifications to net income 0 4      
Net current period other comprehensive income (loss) 49 (2)      
Ending Balance (3) (101) (3) (101)  
Unrealized Gains and Losses on Cash Flow Hedges          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance     85 (114)  
Reclassifications to retained earnings as a result of the adoption of new accounting standards         0
Balance at January 1, 2018         (114)
Net unrealized gain (loss) 29 57      
Reclassifications to net income (64) 93      
Net current period other comprehensive income (loss) (35) 150      
Ending Balance 50 36 50 36  
AOCI Attributable to Parent          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance 130 (170) 80 165  
Reclassifications to retained earnings as a result of the adoption of new accounting standards         (293)
Balance at January 1, 2018         $ (128)
Net unrealized gain (loss) 86 33      
Reclassifications to net income (64) 97      
Net current period other comprehensive income (loss) (28) 172 22 130  
Ending Balance $ 102 $ 2 $ 102 $ 2