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Deferred Policy Acquisition Costs - Progression of deferred policy acquisition costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |  |  |
Deferred policy acquisition costs and present value of future profits, beginning balance |  | $ 1,216 | $ 1,239 | $ 1,184
Deferred policy acquisition costs and present value of future profits, additions |  | 940 | 817 | 774
Deferred policy acquisition costs and present value of future profits, periodic amortization |  | (908) | (744) | (722)
Deferred policy acquisition costs and present value of future profits, annuity unlocking |  | 29 | 41 | 29
Deferred policy acquisition costs and present value of future profits, change included in realized gains |  | 15 | 10 | 8
Deferred policy acquisition costs and present value of future profits, foreign currency translation |  | (2) | 0 | (3)
Deferred policy acquisition costs and present value of future profits, other |  |  | 10 |
Deferred policy acquisition costs and present value of future profits, change in unrealized |  | 392 | (157) | (31)
Deferred policy acquisition costs and present value of future profits, ending balance |  | 1,682 | 1,216 | 1,239
Property and casualty insurance |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |
Deferred policy acquisition costs, beginning balance |  | 270 | 238 | 226
Deferred policy acquisition costs, additions |  | 675 | 588 | 535
Deferred policy acquisition costs, periodic amortization |  | (644) | (556) | (520)
Deferred policy acquisition costs, foreign currency translation |  | (2) | 0 | (3)
Deferred policy acquisition costs, ending balance |  | 299 | 270 | 238
Annuity and Run-off Long-term Care and Life |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |
Deferred policy acquisition costs, beginning balance |  | 1,217 | 1,110 | 1,018
Deferred policy acquisition costs, additions |  | 263 | 225 | 230
Deferred policy acquisition costs, periodic amortization |  | (238) | (161) | (169)
Deferred policy acquisition costs, annuity unlocking |  | 29 | 34 | 25
Deferred policy acquisition costs, change included in realized gains |  | 14 | 9 | 6
Deferred policy acquisition costs, ending balance |  | 1,285 | 1,217 | 1,110
Movement in Deferred Sales Inducements [Roll Forward] |  |  |  |
Deferred sales inducements, beginning balance |  | 102 | 110 | 119
Deferred sales inducements, additions |  | 2 | 4 | 9
Deferred sales inducements, periodic amortization |  | (19) | (19) | (24)
Deferred sales inducements, annuity unlocking |  | 0 | 6 | 4
Deferred sales inducements, change included in realized gains |  | 1 | 1 | 2
Deferred sales inducements, ending balance |  | 86 | 102 | 110
Movement in Present Value of Future Insurance Profits [Roll Forward] |  |  |  |
Present value of future profits, beginning balance |  | 49 | 46 | 55
Present value of future profits, periodic amortization |  | (7) | (8) | (9)
Present value of future profits, annuity unlocking |  | 0 | 1 | 0
Present value of future profits, other |  |  | 10 |
Present value of future profits, ending balance |  | 42 | 49 | 46
Movement in Unrealized Gains (Losses) Related to Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |  |  |
Unrealized investment gains (losses), beginning balance | [1] | (422) | (265) | (234)
Unrealized investment gains (losses), change in unrealized | [1] | 392 | (157) | (31)
Unrealized investment gains (losses), ending balance | [1] | (30) | (422) | (265)
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |  |  |
Deferred policy acquisition costs and present value of future profits, beginning balance |  | 946 | 1,001 | 958
Deferred policy acquisition costs and present value of future profits, additions |  | 265 | 229 | 239
Deferred policy acquisition costs and present value of future profits, periodic amortization |  | (264) | (188) | (202)
Deferred policy acquisition costs and present value of future profits, annuity unlocking |  | 29 | 41 | 29
Deferred policy acquisition costs and present value of future profits, change included in realized gains |  | 15 | 10 | 8
Deferred policy acquisition costs and present value of future profits, other |  |  | 10 |
Deferred policy acquisition costs and present value of future profits, change in unrealized |  | 392 | (157) | (31)
Deferred policy acquisition costs and present value of future profits, ending balance |  | 1,383 | 946 | 1,001
Excluding Unrealized Gains | Annuity and Run-off Long-term Care and Life |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward] |  |  |  |
Deferred policy acquisition costs and present value of future profits, beginning balance |  | 1,368 | 1,266 | 1,192
Deferred policy acquisition costs and present value of future profits, change in unrealized |  | 0 | 0 | 0
Deferred policy acquisition costs and present value of future profits, ending balance |  | $ 1,413 | $ 1,368 | $ 1,266
[1] | Adjustments to DPAC related to net unrealized gains/losses on securities and cash flow hedges.

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