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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance $ 22,751 $ 21,734 $ 21,534 $ 20,501  
Net current period other comprehensive income (loss) 15 34 37 164  
Ending Balance 20,736 23,007 20,736 23,007  
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)     (19) (17)  
Reclassifications to net income     0 0  
Net current period other comprehensive income (loss)     (19) (17)  
Ending Balance 28 68 28 68  
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)     53 25  
Reclassifications to net income     0 4  
Net current period other comprehensive income (loss)     53 29  
Ending Balance 1 (70) 1 (70)  
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)     99 51  
Reclassifications to net income     (96) 101  
Net current period other comprehensive income (loss)     3 152  
Ending Balance 88 38 88 38  
AOCI Attributable to Parent          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance 102 2 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)     133 59  
Reclassifications to net income     (96) 105  
Net current period other comprehensive income (loss) 15 34 37 164  
Ending Balance $ 117 $ 36 $ 117 $ 36