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Reinsurance Reinsurance (Written Consolidated Property Casualty Insurance Premiums On Assumed and Ceded Business) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Direct Premiums Earned $ 5,251 $ 5,052 $ 4,857
Assumed Premiums Earned 149 132 77
Ceded Premiums Earned 230 230 224
Insurance losses and contract holders' benefits 3,490 3,390 3,107
Consolidated Property and Casualty Insurance Entity      
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]      
Direct Premiums Written 5,018 4,854 4,646
Assumed Premiums Written 173 125 103
Ceded Premiums Written (161) (139) (169)
Premiums Written, Net, Property and Casualty 5,030 4,840 4,580
Direct Premiums Earned 4,931 4,752 4,567
Assumed Premiums Earned 149 132 77
Ceded Premiums Earned (160) (162) (162)
Premiums Earned, Net, Property and Casualty 4,920 4,722 4,482
Policyholder Benefits and Claims Incurred, Direct 3,188 2,961 2,874
Policyholder Benefits and Claims Incurred, Assumed 125 113 43
Policyholder Benefits and Claims Incurred, Ceded (90) 64 (56)
Insurance losses and contract holders' benefits $ 3,223 $ 3,138 $ 2,861