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Changes in and Reclassifications From Accumulated Other Comprehensive Income (Loss) - Reclassification from AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 $ (111) $ 173 $ (83)
Net investment income                 1,780 1,603 1,577
Income from continuing operations before income taxes                 1,753 723 447
Income tax expense (benefit)                 268 985 (166)
Income (loss) from discontinued operations, net of tax                 322 (2,869) 283
Net income (loss) $ 196 $ 432 $ 582 $ 597 $ (3,703) $ 234 $ (40) $ 378 1,807 (3,131) 896
Insurance operating costs and other expenses                 4,281 4,563 3,525
Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net income (loss)                 (69) (269) (5)
Net Unrealized Gain on Securities | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 (80) 152 36
Income from continuing operations before income taxes                 (80) 152 36
Income tax expense (benefit)                 (17) 53 13
Income (loss) from discontinued operations, net of tax                 (2) 103 63
Net income (loss)                 (65) 202 86
OTTI Losses in OCI | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 0 0 (2)
Income from continuing operations before income taxes                 0 0 (2)
Income tax expense (benefit)                 0 0 (1)
Income (loss) from discontinued operations, net of tax                 1 0 (2)
Net income (loss)                 1 0 (3)
Net Gain (Loss) on Cash Flow Hedging Instruments | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Income from continuing operations before income taxes                 36 42 47
Income tax expense (benefit)                 8 15 17
Income (loss) from discontinued operations, net of tax                 5 23 16
Net income (loss)                 33 50 46
Net Gain (Loss) on Cash Flow Hedging Instruments | Amount Reclassified from AOCI | Interest rate swaps                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 6 5 10
Net investment income                 30 37 37
Foreign Currency Translation Adjustments | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 0 0 (118)
Income from continuing operations before income taxes                 0 0 (118)
Income tax expense (benefit)                 0 0 (20)
Net income (loss)                 0 0 (98)
Amortization of prior service credit | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Insurance operating costs and other expenses                 7 7 6
Amortization of actuarial loss | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Insurance operating costs and other expenses                 (55) (61) (61)
Settlement loss | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Insurance operating costs and other expenses                 0 (747) 0
Pension and Other Postretirement Plan Adjustments | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Income from continuing operations before income taxes                 (48) (801) (55)
Income tax expense (benefit)                 (10) (280) (19)
Net income (loss)                 $ (38) $ (521) $ (36)