Shareholders' Equity - Additional Information (Detail) - USD ($)		3 Months Ended
	Apr. 22, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 11, 2015	Oct. 23, 2014	Jul. 25, 2013
Stockholders Equity [Line Items]
Dividends declared per common share		$ 0.06	$ 0.06
Cost of treasury stock		$ 2,000,000,000		$ 500,000,000	$ 1,000,000,000	$ 500,000,000
Program executed within limitations of authority granted date		Aug. 06, 2015
Stock repurchase program approval date		May 12, 2020
Cumulative shares repurchased		39,426,521
Average price of common stock purchased		$ 44.95
Payments for repurchase of common stock		$ 1,772,000,000
Repurchases of common stock		0
Maximum
Stockholders Equity [Line Items]
Cost of treasury stock		$ 2,000,000,000
Subsequent Event
Stockholders Equity [Line Items]
Declaration Date	Apr. 22, 2021
Dividends declared per common share	$ 0.06
Cash dividend, date to be Paid	Jun. 17, 2021
Cash dividend, recorded date	Jun. 03, 2021