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Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Mar. 31, 2017
May 31, 2016
Sale Leaseback Transaction [Line Items]      
Short-term Investments $ 4,349 $ 5,444  
Document Period End Date Jun. 30, 2017    
Marketable Securities, Equity Securities $ 47 46  
Time Deposits 2,800 3,000  
Commercial Paper 1,500 $ 2,400  
Handset Sale-Leaseback Tranche 2 [Member]      
Sale Leaseback Transaction [Line Items]      
Sale Leaseback Transaction, Net Book Value 470   $ 1,300
Repayments of Debt 158    
Handset Sale-Leaseback Tranche 2 [Member] | MLS 2nd Tranche [Member]      
Sale Leaseback Transaction [Line Items]      
Sale Leaseback Transaction, Net Book Value $ 227