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Financial Instruments (Tables)

3 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Schedule of carrying amount and estimated fair values of our exchangeable notes as well as current and long-term debt

The following table presents carrying amounts and estimated fair values of current and long-term debt:



	Carrying amount at June 30, 2016				Estimated Fair Value Using Input Type
	Carrying amount at June 30, 2016				Quoted prices in active markets				Observable				Unobservable				Total estimated fair value
	(in millions)
Current and long-term debt	$	36,266			$	23,226			$	4,558			$	5,351			$	33,135



	Carrying amount at March 31, 2016				Estimated Fair Value Using Input Type
	Carrying amount at March 31, 2016				Quoted prices in active markets				Observable				Unobservable				Total estimated fair value
	(in millions)
Current and long-term debt	$	33,645			$	21,757			$	4,474			$	2,130			$	28,361