Stockholders' Equity and Earnings per Share - Narrative (Detail) € / shares in Units, € in Millions			12 Months Ended
	Jun. 17, 2019	Jul. 26, 2018 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2019 EUR (€) € / shares shares	Dec. 31, 2018 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, amount authorized | $		$ 5,000,000,000
Share repurchase program, stock period	18 months	18 months
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)			15,900,000	54,400,000
Treasury stock, value, acquired, including shares retired | $			$ 1,400,000,000	$ 5,000,000,000
Treasury shares, retired (in shares)			13,183,081	17,300,143	0
Shares acquired under repurchase program (in shares)			15,865,718	54,376,181	2,522,589
Shares acquired under the repurchase program, amount | $			$ 221,000,000	$ 3,353,000,000	$ 286,000,000
Common stock, issued and fully paid (in shares)			315,519,638	328,702,719		315,519,638	328,702,719
Common stock, par value (in euros per share) | € / shares						€ 0.20	€ 0.20
Nominal stock capital (in Euro)			$ 64,000,000	$ 67,000,000		€ 63	€ 66