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Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]      
Equity Securities, FV-NI, Unrealized Gain (Loss) $ 14 $ 82  
Recurring      
Schedule of Investments [Line Items]      
Cash 8,553 8,553 $ 10,406
Total Estimated Fair Value      
Cash, cash equivalents and marketable securities 41,814 41,814 41,676
Less: Restricted cash, cash equivalents, and marketable securities (351) (351) (426)
Total cash, cash equivalents, and marketable securities 41,463 41,463 41,250
Cost or Amortized Cost      
Cash, cash equivalents and marketable securities 41,492 41,492  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax      
Debt Securities, Available for Sale, Unrealized Gain 53 53  
Debt Securities, Available for Sale, Unrealized Loss (8) (8)  
Recurring | Level 1 securities      
Total Estimated Fair Value      
Equity Securities, FV-NI 277 277 170
Recurring | Level 1 securities | Money market funds      
Schedule of Investments [Line Items]      
Money market funds 10,757 10,757 12,515
Recurring | Level 2 securities      
Total Estimated Fair Value      
Equity Securities, FV-NI 0 0 33
Recurring | Level 2 securities | Foreign government and agency securities      
Total Estimated Fair Value      
Debt Securities, Available for Sale, Fair Value 1,596 1,596 815
Cost or Amortized Cost      
Debt Securities, Available for Sale, Cost 1,596 1,596  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax      
Debt Securities, Available for Sale, Unrealized Gain 0 0  
Debt Securities, Available for Sale, Unrealized Loss 0 0  
Recurring | Level 2 securities | U.S. government and agency securities      
Total Estimated Fair Value      
Debt Securities, Available for Sale, Fair Value 8,581 8,581 11,667
Cost or Amortized Cost      
Debt Securities, Available for Sale, Cost 8,573 8,573  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax      
Debt Securities, Available for Sale, Unrealized Gain 13 13  
Debt Securities, Available for Sale, Unrealized Loss (5) (5)  
Recurring | Level 2 securities | Corporate debt securities      
Total Estimated Fair Value      
Debt Securities, Available for Sale, Fair Value 9,944 9,944 4,990
Cost or Amortized Cost      
Debt Securities, Available for Sale, Cost 9,915 9,915  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax      
Debt Securities, Available for Sale, Unrealized Gain 31 31  
Debt Securities, Available for Sale, Unrealized Loss (2) (2)  
Recurring | Level 2 securities | Asset-backed securities      
Total Estimated Fair Value      
Debt Securities, Available for Sale, Fair Value 1,840 1,840 892
Cost or Amortized Cost      
Debt Securities, Available for Sale, Cost 1,834 1,834  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax      
Debt Securities, Available for Sale, Unrealized Gain 7 7  
Debt Securities, Available for Sale, Unrealized Loss (1) (1)  
Recurring | Level 2 securities | Other fixed income securities      
Total Estimated Fair Value      
Debt Securities, Available for Sale, Fair Value 266 266 $ 188
Cost or Amortized Cost      
Debt Securities, Available for Sale, Cost 264 264  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax      
Debt Securities, Available for Sale, Unrealized Gain 2 2  
Debt Securities, Available for Sale, Unrealized Loss $ 0 $ 0