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Marketable Securities and Held-to-Maturity Debt Securities - Current and non-current (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Held-to-Maturity Debt Securities    
Current marketable securities $ 98 $ 380
Non-current marketable securities 43 37
Total marketable securities 141 417
Commercial paper    
Held-to-Maturity Debt Securities    
Current marketable securities 85 366
Certificates of deposit/time deposits    
Held-to-Maturity Debt Securities    
Current marketable securities 10 10
U.S. municipal securities    
Held-to-Maturity Debt Securities    
Current marketable securities 3 3
Non-current marketable securities $ 43 37
Asset-backed securities    
Held-to-Maturity Debt Securities    
Current marketable securities   $ 1