Schedule II - Condensed Statements of Cash Flows Parent Company (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Cash provided by operating activities	$ 780	$ 1,220	$ 1,085
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash effect of acquisitions/dispositions	(278)	(187)	(393)
Purchases of equity securities	(157)	(198)	(194)
Proceeds from sales of property and equipment	7	18	14
Cash used for investing activities	(395)	(3,393)	(1,415)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of unsecured senior notes	0	642	444
Borrowings under unsecured credit facility	0	0	120
Repayments of borrowings under unsecured credit facility	0	0	280
Net proceeds (payments) in connection with share-based compensation	2	6	(1)
Repurchases of Company shares	441	99	139
Payments of cash dividends	217	213	199
Cash (used for) provided by financing activities	(376)	2,126	113
Net (decrease) increase in cash and cash equivalents	(4)	(47)	(211)
Cash and cash equivalents—Beginning of year	1,228	1,275	1,486
Cash and cash equivalents—End of year	1,224	1,228	1,275	$ 1,486
Parent Company
CASH FLOWS FROM OPERATING ACTIVITIES:
Cash provided by operating activities	779	641	600
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash effect of acquisitions/dispositions	(296)	0	0
Net payments to subsidiaries	(155)	(259)	(668)
Purchases of equity securities	0	0	(19)
Proceeds from sales of property and equipment	0	0	7
Cash used for investing activities		(259)	(680)	(451)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of unsecured senior notes	0	642	444
Borrowings under unsecured credit facility	0	0	120
Repayments of borrowings under unsecured credit facility	0	0	(280)
Net proceeds (payments) in connection with share-based compensation	2	6	(1)
Repurchases of Company shares	(441)	(99)	(139)
Payments of cash dividends	(217)	(213)	(199)
Cash (used for) provided by financing activities	(656)	336	(55)
Net (decrease) increase in cash and cash equivalents		718	(135)	(328)
Cash and cash equivalents—Beginning of year	925	207	342
Cash and cash equivalents—End of year	$ 597	$ 925	$ 207	$ 342

The cash outflow to acquire equity securities.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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