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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term Investments $ 4,008 $ 2,354
Certificates of Deposit, at Carrying Value   1,600
Document Period End Date Jun. 30, 2018  
Marketable Securities, Equity Securities $ 41 57
Commercial Paper, at Carrying Value   $ 765