Borrowings and Lines of Credit (Short-term Debt Outstanding) (Detail) - USD ($) $ in Millions	1 Months Ended
	Apr. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Short-term borrowings		$ 403	$ 10
Weighted average interest rate		1.70%	3.60%
$1.5 billion 364-Day Term Loan [Member]
Short-term Debt [Line Items]
Short-term borrowings	$ 1,500
Debt Instrument, Term	364 days