Financial Instruments (Tables)

3 Months Ended

Jun. 30, 2019

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 and financing obligations:

	Carrying amount at June 30, 2019		Estimated Fair Value Using Input Type
			Quoted prices in active markets		Observable		Unobservable		Total estimated fair value
	(in millions)
Current and long-term debt and financing obligations	$	38,335	$	35,601	$	198	$	4,076	$	39,875

	Carrying amount at March 31, 2019		Estimated Fair Value Using Input Type
			Quoted prices in active markets		Observable		Unobservable		Total estimated fair value
	(in millions)
Current and long-term debt and financing obligations	$	40,193	$	36,642	$	197	$	3,970	$	40,809