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Financial Instruments (Narative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
May 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Nov. 19, 2015
Sale Leaseback Transaction [Line Items]          
Sale Leaseback Transaction, Net Book Value       $ 1,300 $ 1,300
Repayments of Accounts Receivable Securitization $ 654        
Short-term investments 5,444   $ 0    
Time Deposits 3,000        
Commercial Paper 2,400        
Fair value of marketable equity securities 46   $ 46    
MLS 2nd Tranche [Member]          
Sale Leaseback Transaction [Line Items]          
Sale Leaseback Transaction, Net Book Value 385 $ 1,300      
Sale Leaseback Transaction Current Period Gain (Loss) Recognized $ (24)