Restructuring Reserve by Type (Details) $ in Millions	3 Months Ended
	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Costs	$ 71
Programming inventory restructure	77
Restructuring Charges and Programming Inventory Restructure, Net of Tax	148
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring	41	[1]
Exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring	27
Other related costs
Restructuring Cost and Reserve [Line Items]
Restructuring	3
Allocated Share-Based Compensation Expense [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	1
Media Networks
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Costs	50
Programming inventory restructure	74
Restructuring Charges and Programming Inventory Restructure, Net of Tax	124
Media Networks | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring	23	[1]
Media Networks | Exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring	27
Media Networks | Other related costs
Restructuring Cost and Reserve [Line Items]
Restructuring	0
Filmed Entertainment
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Costs	14
Programming inventory restructure	3
Restructuring Charges and Programming Inventory Restructure, Net of Tax	17
Filmed Entertainment | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring	14
Filmed Entertainment | Exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring	0
Filmed Entertainment | Other related costs
Restructuring Cost and Reserve [Line Items]
Restructuring	0
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Costs	7
Programming inventory restructure	0
Restructuring Charges and Programming Inventory Restructure, Net of Tax	7
Corporate | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring	4
Corporate | Exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring	0
Corporate | Other related costs
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 3

[1] Includes equity-based compensation expense of $1 million in the quarter ended December 31, 2018.