Derivatives and Other Financial Instruments - Schedule of Carrying Values and Fair Values of Other Financial Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Carrying Value [Member]
Derivative [Line Items]
Cash and cash equivalents	$ 2,544	$ 1,607
Restricted cash	3	3
Short-term borrowings	77	77
Long-term debt due within one year	745	2
Long-term debt, less amount due within one year	2,214	2,463
Fair Value [Member]
Derivative [Line Items]
Cash and cash equivalents	2,544	1,607
Restricted cash	3	3
Short-term borrowings	77	77
Long-term debt due within one year	777	2
Long-term debt, less amount due within one year	$ 2,386	$ 2,692