Schedule of Information Related to Stock Repurchase Programs (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jul. 31, 2021	Dec. 31, 2018
Class of Stock [Line Items]
Additional dollars authorized for repurchase		$ 3,700,000,000			$ 1,000,000,000.0
Aggregate purchase price paid for shares purchased as part of publicly announced program		$ 1,220,875,000	$ 206,719,000	$ 753,927,000
Stock Repurchase Program
Class of Stock [Line Items]
Total number of shares purchased as part of publicly announced programs		15,759,373
Average price paid per share for shares purchased as part of publicly announced program		$ 133.51
Aggregate purchase price paid for shares purchased as part of publicly announced program		$ 2,104,111,000
Stock Repurchase Programs Twenty Eighteen
Class of Stock [Line Items]
Maximum number of dollars that may yet be purchased under the program						$ 462,344,000
Stock Repurchase Programs Twenty Nineteen
Class of Stock [Line Items]
Additional dollars authorized for repurchase				$ 1,000,000,000
Total number of shares purchased	[1]			5,762,409
Total number of shares cancelled				27,713
Average price paid per share for forfeited restricted shares				$ 0.01
Total number of shares purchased as part of publicly announced programs				5,397,753
Aggregate purchase price paid				$ 753,928,000
Aggregate purchase price paid for shares purchased as part of publicly announced program				706,200,000
Maximum number of dollars that may yet be purchased under the program				$ 756,123,000
Stock Repurchase Programs Twenty Nineteen | Stock Repurchase Program
Class of Stock [Line Items]
Total number of shares purchased as part of publicly announced programs				5,397,753
Average price paid per share for shares purchased as part of publicly announced program				$ 130.84
Aggregate purchase price paid for shares purchased as part of publicly announced program				$ 706,221,000
Stock Repurchase Programs Twenty Twenty
Class of Stock [Line Items]
Total number of shares purchased	[1]		2,050,735
Total number of shares cancelled			17,779
Average price paid per share for forfeited restricted shares			$ 0.01
Total number of shares purchased as part of publicly announced programs			1,951,899
Aggregate purchase price paid			$ 206,719,000
Aggregate purchase price paid for shares purchased as part of publicly announced program			196,600,000
Maximum number of dollars that may yet be purchased under the program			$ 559,563,000
Stock Repurchase Programs Twenty Twenty | Stock Repurchase Program
Class of Stock [Line Items]
Total number of shares purchased as part of publicly announced programs			1,951,899
Average price paid per share for shares purchased as part of publicly announced program			$ 100.70
Aggregate purchase price paid for shares purchased as part of publicly announced program			$ 196,560,000
Stock Repurchase Programs Twenty Twenty One
Class of Stock [Line Items]
Additional dollars authorized for repurchase		$ 1,000,000,000
Total number of shares purchased	[1]	8,559,946
Total number of shares cancelled		15,761
Average price paid per share for forfeited restricted shares		$ 0.01
Total number of shares purchased as part of publicly announced programs		8,409,721
Aggregate purchase price paid		$ 1,220,876,000
Aggregate purchase price paid for shares purchased as part of publicly announced program		1,200,000,000
Maximum number of dollars that may yet be purchased under the program		$ 358,233,000
Stock Repurchase Programs Twenty Twenty One | Stock Repurchase Program
Class of Stock [Line Items]
Total number of shares purchased as part of publicly announced programs		8,409,721
Average price paid per share for shares purchased as part of publicly announced program		$ 142.85
Aggregate purchase price paid for shares purchased as part of publicly announced program		$ 1,201,330,000
Stock Repurchase Programs Twenty Nineteen to Twenty Twenty One
Class of Stock [Line Items]
Additional dollars authorized for repurchase		$ 2,000,000,000
Total number of shares purchased	[1]	16,373,090
Total number of shares cancelled		61,253
Average price paid per share for forfeited restricted shares		$ 0.01
Aggregate purchase price paid		$ 2,181,523,000

[1] Includes 15,761, 17,779 and, 27,713  of restricted shares that were forfeited by former employees pursuant to the terms of our restricted stock purchase plan during 2021, 2020 and 2019, respectively.