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Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Operating lease liabilities	$ 83	$ 74
Income taxes	2,313	1,985
Interest	226	226
Operating lease liabilities	68	63
Common equities
Common share dividends	59	59
Cash and Cash Equivalents
Open reverse repurchase commitments	$ 58	$ 89	$ 127

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