Equity-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018	Mar. 20, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock or Unit Expense	[1]	$ 100	$ 77	$ 173	$ 148
Weighted average grant date fair values of options issued			$ 28.01	$ 28.67
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		170		$ 170
Stock compensation granted, number of shares				3.9
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		827		$ 827
Stock compensation granted, number of shares				3.3
21CF | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		$ 141		$ 141		$ 218

[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.