Pension and Other Benefit Plans (Tables)

6 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

The components of net periodic pension income were:

	Three Months Ended				Six Months Ended
(in millions)	September 30, 2020		September 30, 2019		September 30, 2020		September 30, 2019
Service cost	$	23	$	23	$	45	$	46
Interest cost	61		57		119		117
Expected return on assets	(161)		(154)		(314)		(315)
Amortization of prior service costs	(2)		(2)		(4)		(4)
Contractual termination benefit	3		6		3		17
Curtailment gain	—		—		(9)		—
Recognition of actuarial loss	—		—		11		—
Net periodic pension income	$	(76)	$	(70)	$	(149)	$	(139)