Revenue Related to Contracts with Customers - Narrative (Details) - USD ($) $ in Billions	Mar. 31, 2020	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Performance obligations expected to be satisfied	$ 22.7	$ 20.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Period one
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, percent	53.00%
Performance obligations expected to be satisfied, expected timing	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Period two
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, percent	67.00%
Performance obligations expected to be satisfied, expected timing	5 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 | Period three
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be satisfied, percent	91.00%
Performance obligations expected to be satisfied, expected timing	15 years