Shareholders' Equity - Accelerated Share Repurchases (Detail) - USD ($) shares in Thousands, $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Oct. 31, 2021	Jul. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2021
Capital in Excess of Par Value
Accelerated Share Repurchases [Line Items]
Treasury Stock, Value, Acquired, Cost Method					$ 150
Treasury Stock
Accelerated Share Repurchases [Line Items]
Treasury Stock, Shares, Acquired					6,643
Treasury Stock, Value, Acquired, Cost Method					$ 1,600
Accelerated Share Repurchase Program
Accelerated Share Repurchases [Line Items]
Treasury Stock, Shares, Acquired		403	2,515	1,658
Total Shares to be Delivered Under Accelerated Share Repurchase Program			2,977	2,062
Stock Repurchase Program, Authorized Amount			$ 750	$ 500	$ 750
Accelerated Share Repurchase Program | Subsequent Event
Accelerated Share Repurchases [Line Items]
Treasury Stock, Shares, Acquired	462
Accelerated Share Repurchase Program | Capital in Excess of Par Value | Subsequent Event
Accelerated Share Repurchases [Line Items]
Treasury Stock, Value, Acquired, Cost Method	$ 150
Accelerated Share Repurchase Program | Treasury Stock | Subsequent Event
Accelerated Share Repurchases [Line Items]
Treasury Stock, Value, Acquired, Cost Method	$ 150