Pension and Other Benefit Plans (Tables)

9 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

The components of net periodic pension income were:

	Three Months Ended				Nine Months Ended
(in millions)	December 31, 2020		December 31, 2019		December 31, 2020		December 31, 2019
Service cost	$	23	$	23	$	68	$	69
Interest cost	62		60		181		177
Expected return on assets	(163)		(161)		(477)		(476)
Amortization of prior service costs	(2)		(2)		(6)		(6)
Contractual termination benefit	—		—		3		17
Curtailment gain	—		—		(9)		—
Recognition of actuarial loss	—		—		11		—
Net periodic pension income	$	(80)	$	(80)	$	(229)	$	(219)