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Schedule VI (SUPPLEMENTARY INFORMATION CONCERNING PROPERTY AND CASUALTY OPERATIONS) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]      
Deferred Policy Acquisition Costs $ 3,926 $ 3,805 $ 3,537
Net Reserves for Unpaid Losses 48,271 49,165 47,832
Unearned Premiums 15,532 15,216 14,779
Net Premiums Earned 29,042 28,054 27,747
Net Investment Income 3,047 2,890 2,656
Current Year Claim and Claim Adjustment Expense 19,048 19,391 17,256
Prior Year Claim and Claim Adjustment Expense (981) (937) (1,204)
Net Losses and Loss Expenses Incurred Related to Prior Year [1] (981) (937) (1,204)
Amortization of Deferred Policy Acquisition Costs 5,630 5,519 5,654
Net Paid Losses and Loss Expenses 18,340 17,448 15,715
Net Premiums Written $ 29,505 $ 28,225 $ 27,074
[1] Relates to prior period loss reserve development only and excludes prior period development related to reinstatement premiums, expense adjustments and earned premiums totaling $85 million, $108 million and $69 million for 2018, 2017, and 2016, respectively.