Restructuring Costs - Narrative (Details) $ in Millions	Dec. 31, 2019 USD ($)
Fiscal 2019 Plan
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	$ 491
Fiscal 2019 Plan | Workforce Reductions
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	348
Fiscal 2019 Plan | Facilities Costs
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	143
Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	774
Fiscal 2018 Plan | Workforce Reductions
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	587
Fiscal 2018 Plan | Facilities Costs
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	187
Fiscal 2017 Plan
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	215
Fiscal 2017 Plan | Workforce Reductions
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	206
Fiscal 2017 Plan | Facilities Costs
Restructuring Cost and Reserve [Line Items]
Cost incurred to date	$ 9