Restructuring and Impairment Charges - Additional Details (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 662	$ 13	$ 662	$ 28
Restricted Stock or Unit Expense	[1]	100	$ 77	$ 173	$ 148
21CF | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		403
Scenario, Plan | 21CF
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,500
Vest Upon Acquisition | 21CF
Restructuring Cost and Reserve [Line Items]
Restricted Stock or Unit Expense		$ 259

[1] Excludes 21CF RSUs converted to Company RSUs in connection with the acquisition of 21CF (see Note 4). The Company recognized $259 million of equity based compensation in connection with the 21CF acquisition.