Stock Compensation Plans - RSU, PRS and Cash RSU Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
RSU's [Member]
Number of Shares
Beginning balance (in shares)	937,000
Granted (in shares)	843,000
Vested (in shares)	(315,000)
Forfeited (in shares)	(78,000)
Change due to performance conditions, net (in shares)	(20,000)
Ending balance (in shares)	1,367,000	937,000
Weighted Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share)	$ 120.81
Granted (in dollars per share)	87.31
Vested (in dollars per share)	119.15
Forfeited (in dollars per share)	105.63
Change due to performance conditions, net (in dollars per share)	134.04
Ending balance (in dollars per share)	$ 101.50	$ 120.81
Cash RSU's [Member]
Number of Shares
Beginning balance (in shares)	119,000
Granted (in shares)	19,000
Vested (in shares)	(40,000)
Forfeited (in shares)	(7,000)
Ending balance (in shares)	91,000	119,000
Weighted Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share)	$ 104.84
Granted (in dollars per share)	80.97
Vested (in dollars per share)	94.72
Forfeited (in dollars per share)	82.24
Ending balance (in dollars per share)	$ 80.97	$ 104.84
Purchased Restricted Stock Unit
Number of Shares
Beginning balance (in shares)	90,000
Granted (in shares)	0
Vested (in shares)	(26,000)
Forfeited (in shares)	(3,000)
Ending balance (in shares)	61,000	90,000
Weighted Average Grant Date Fair Value Per Share
Beginning balance (in dollars per share)	$ 133.36
Granted (in dollars per share)	0
Vested (in dollars per share)	131.31
Forfeited (in dollars per share)	138.98
Ending balance (in dollars per share)	$ 133.96	$ 133.36
Issued Shares (in shares)	0	43,690	61,870
Aggregate purchase price (in dollars per share)	$ 0	$ 6	$ 9
Covered shares (in shares)	0	21,845	30,935