Commitments and Contingencies - Guarantor Obligations (Details) $ in Millions	Dec. 31, 2019 USD ($)
Guarantor Obligations [Line Items]
Fiscal 2020	$ 184
Fiscal 2021	501
Fiscal 2022 and Thereafter	603
Total	1,288
Surety bonds
Guarantor Obligations [Line Items]
Fiscal 2020	20
Fiscal 2021	334
Fiscal 2022 and Thereafter	161
Total	515
Letters of credit
Guarantor Obligations [Line Items]
Fiscal 2020	104
Fiscal 2021	68
Fiscal 2022 and Thereafter	411
Total	583
Stand-by letters of credit
Guarantor Obligations [Line Items]
Fiscal 2020	60
Fiscal 2021	99
Fiscal 2022 and Thereafter	31
Total	$ 190