Schedule II - Condensed Statements of Cash Flows Parent Company (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Cash provided by operating activities	$ 1,220	$ 1,085	$ 913
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash effect of acquisitions/dispositions	(187)	(393)	(20)
Purchases of equity securities	(198)	(194)	(269)
Proceeds from sales of property and equipment	18	14	1
Cash used for investing activities	(3,393)	(1,415)	(452)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of unsecured senior notes	642	444	0
Borrowings under unsecured credit facility	0	120	160
Repayments of borrowings under unsecured credit facility	0	280	160
Net proceeds (payments) in connection with share-based compensation	6	(1)	(1)
Repurchases of Company shares	99	139	2
Payments of cash dividends	213	199	188
Cash provided by (used for) financing activities	2,126	113	(445)
Net increase (decrease) in cash and cash equivalents	(47)	(211)	19
Cash and cash equivalents—Beginning of year	1,275	1,486	1,467
Cash and cash equivalents—End of year	1,228	1,275	1,486
Parent Company
CASH FLOWS FROM OPERATING ACTIVITIES:
Cash provided by operating activities	641	600	356
CASH FLOWS FROM INVESTING ACTIVITIES:
Net cash effect of acquisitions/dispositions	0	0	(15)
Net payments to subsidiaries	(259)	(668)	(58)
Purchases of equity securities	0	(19)	(77)
Proceeds from sales of property and equipment	0	7	0
Cash used for investing activities	(259)	(680)	(150)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of unsecured senior notes	642	444	0
Borrowings under unsecured credit facility	0	120	160
Repayments of borrowings under unsecured credit facility	0	(280)	(160)
Net proceeds (payments) in connection with share-based compensation	6	(1)	(1)
Repurchases of Company shares	(99)	(139)	(2)
Payments of cash dividends	(213)	(199)	(188)
Cash provided by (used for) financing activities	336	(55)	(191)
Net increase (decrease) in cash and cash equivalents	718	(135)	15
Cash and cash equivalents—Beginning of year	207	342	327
Cash and cash equivalents—End of year	$ 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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