Schedule VI Supplementary Information Concerning Property and Casualty Insurance Operations (Details) - Property and Casualty Insurance Products - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Line Items]
Discount Deducted From Liabilities	$ 355	$ 367	$ 388
Losses and Loss Adjustment Expenses Incurred Related to: Current Year	7,911	7,794	7,463
Losses and Loss Adjustment Expenses Incurred Related to: Prior Year	199	(136)	(65)
Paid Losses and Loss Adjustment Expenses	$ 6,395	$ 6,404	$ 6,748