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Schedule VI Supplementary Information Concerning Property and Casualty Insurance Operations (Details) - Property and Casualty Insurance Products - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Discount Deducted From Liabilities	$ 367	$ 388	$ 388
Losses and Loss Adjustment Expenses Incurred Related to: Current Year	7,794	7,463	7,107
Losses and Loss Adjustment Expenses Incurred Related to: Prior Year	(136)	(65)	(167)
Paid Losses and Loss Adjustment Expenses	$ 6,404	$ 6,748	$ 6,406

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Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process.

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Amount of cumulative discount related to the time value of money deducted from short-duration insurance contract liabilities that are reported at present value.

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Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs.

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Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

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