Commitments and Contingencies - Guarantor Obligations (Details) $ in Millions	Mar. 31, 2020 USD ($)
Guarantor Obligations [Line Items]
Fiscal 2021	$ 551
Fiscal 2022	257
Fiscal 2023 and Thereafter	507
Total	1,315
Surety bonds
Guarantor Obligations [Line Items]
Fiscal 2021	374
Fiscal 2022	83
Fiscal 2023 and Thereafter	85
Total	542
Letters of credit
Guarantor Obligations [Line Items]
Fiscal 2021	102
Fiscal 2022	96
Fiscal 2023 and Thereafter	397
Total	595
Stand-by letters of credit
Guarantor Obligations [Line Items]
Fiscal 2021	75
Fiscal 2022	78
Fiscal 2023 and Thereafter	25
Total	$ 178