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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, 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
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 $ 173 $ (83) $ 29
Net investment income                 1,603 1,577 1,561
Income from continuing operations before income taxes                 723 447 1,478
Income tax expense (benefit)                 985 (166) 289
(Loss) income from discontinued operations, net of tax $ (3,145) $ 89 $ 112 $ 75 $ 54 $ 87 $ 117 $ 25 (2,869) 283 493
(Loss) income from discontinued operations, net of tax                 (2,869) 283 493
Net (loss) income $ (3,703) $ 234 $ (40) $ 378 $ (81) $ 438 $ 216 $ 323 (3,131) 896 1,682
Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net (loss) income                 (269) (5) (22)
Net Unrealized Gain on Securities | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 152 36 (5)
Income from continuing operations before income taxes                 152 36 (5)
Income tax expense (benefit)                 53 13 (2)
(Loss) income from discontinued operations, net of tax                 103 63 (18)
Net (loss) income                 202 86 (21)
OTTI Losses in OCI | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 0 (2) (1)
Income from continuing operations before income taxes                 0 (2) (1)
Income tax expense (benefit)                 0 (1) 0
(Loss) income from discontinued operations, net of tax                 0 (2) 0
Net (loss) income                 0 (3) (1)
Net Gain on Cash Flow Hedging Instruments | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Income from continuing operations before income taxes                 42 47 36
Income tax expense (benefit)                 15 17 13
(Loss) income from discontinued operations, net of tax                 23 16 15
Net (loss) income                 50 46 38
Net Gain on Cash Flow Hedging Instruments | Amount Reclassified from AOCI | Interest rate swaps                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 5 10 5
Net investment income                 37 37 31
Foreign Currency Translation Adjustments | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net realized capital gains (losses)                 0 (118) 0
Income from continuing operations before income taxes                 0 (118) 0
Income tax expense (benefit)                 0 (20) 0
Net (loss) income                 0 (98) 0
Amortization of prior service credit | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Total before tax                 7 6 7
Amortization of actuarial loss | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Total before tax                 (61) (61) (65)
Settlement loss | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Total before tax                 (747) 0 0
Pension and Other Postretirement Plan Adjustments | Amount Reclassified from AOCI                      
Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Total before tax                 (801) (55) (58)
Income tax expense (benefit)                 (280) (19) (20)
Net (loss) income                 $ (521) $ (36) $ (38)