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Segment Information - Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 $ 15,121 $ 14,554 $ 14,361
Total net investment income                 1,603 1,577 1,561
Net realized capital gains (loss)                 165 (110) (12)
Other revenues                 85 86 87
Total revenues $ 4,539 $ 4,144 $ 4,168 $ 4,123 $ 3,978 $ 4,114 $ 4,085 $ 3,930 16,974 16,107 15,997
Group life                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 3,677 3,223 3,136
Operating Segments | Commercial Lines                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 6,902 6,690 6,551
Total net investment income                 949 917 910
Installment fees                 37 39 40
Operating Segments | Commercial Lines | Workers’ compensation                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 3,287 3,187 3,065
Operating Segments | Commercial Lines | Liability                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 604 585 568
Operating Segments | Commercial Lines | Package business                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 1,301 1,249 1,223
Operating Segments | Commercial Lines | Property                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 604 577 638
Operating Segments | Commercial Lines | Professional liability                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 246 231 222
Operating Segments | Commercial Lines | Bond                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 230 218 218
Operating Segments | Commercial Lines | Automobile                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 630 643 617
Operating Segments | Personal Lines                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 3,734 3,937 3,910
Total net investment income                 141 135 128
Installment fees                 44 39 37
Operating Segments | Personal Lines | AARP Members                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 3,200 3,300 3,200
Operating Segments | Personal Lines | Automobile                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 2,617 2,749 2,698
Operating Segments | Personal Lines | Homeowners                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 1,117 1,188 1,212
Operating Segments | Property & Casualty Other Operations                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 0 0 32
Total net investment income                 106 127 133
Operating Segments | Group Benefits                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 3,677 3,223 3,136
Total net investment income                 381 366 371
Operating Segments | Group Benefits | Group disability                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 1,718 1,506 1,479
Operating Segments | Group Benefits | Group life                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 1,745 1,512 1,477
Operating Segments | Group Benefits | Other                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 214 205 180
Operating Segments | Mutual Funds                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 804 701 723
Total net investment income                 3 1 1
Operating Segments | Mutual Funds | Discontinued Operations, Held-for-sale                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 98 100 116
Operating Segments | Mutual Funds | Mutual Fund                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 706 601 607
Corporate                      
Segment Reporting Information [Line Items]                      
Earned premiums and fee income                 4 3 9
Total net investment income                 $ 23 $ 31 $ 18