Stockholders' Equity and Earnings per Share - Narrative (Detail) € / shares in Units, € in Millions, $ in Millions			12 Months Ended
	Dec. 15, 2020 shares	Nov. 27, 2019 shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 shares	Dec. 31, 2020 EUR (€) € / shares shares	Dec. 31, 2019 EUR (€) € / shares shares	Oct. 31, 2018 shares
Class of Stock [Line Items]
Capital stock, authorized (in shares)			1,076,257,500			1,076,257,500
Common stock, authorized shares (in shares)			430,503,000	430,503,000		430,503,000	430,503,000
Preferred stock, shares authorized (in shares)			645,754,500	645,754,500		645,754,500	645,754,500
Share repurchase program, percentage authorized								0.20
Share repurchase program, additional shares authorized (in shares)								69,000,000
Treasury stock, shares, acquired, including shares retired (in shares)			4,800,000	15,900,000
Treasury stock, value, acquired, including shares retired | $			$ 600	$ 1,400
Treasury shares, retired (in shares)	26,000,000	13,200,000	26,000,000	13,183,081	17,300,143
Shares acquired under repurchase program (in shares)			4,828,913	15,865,718	54,376,181
Common stock, issued and fully paid (in shares)			289,519,638	315,519,638		289,519,638	315,519,638
Common stock, par value (in euros per share) | € / shares						€ 0.20	€ 0.20
Nominal stock capital (in Euro)			$ 59	$ 64		€ 58	€ 63
Stock Options | Maximum
Class of Stock [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)			0	100,000	100,000