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Deferred Policy Acquisition Costs - Progression of deferred policy acquisition costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
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 |  | $ 1,582 | $ 1,156 | $ 1,216 | $ 1,239
Deferred policy acquisition costs and present value of future profits, additions |  | 247 | 194 | 718 | 619
Deferred policy acquisition costs and present value of future profits, periodic amortization |  | (236) | (192) | (699) | (555)
Deferred policy acquisition costs and present value of future profits, annuity unlocking |  |  |  | 29 |
Deferred policy acquisition costs and present value of future profits, change included in realized gains |  | 3 | 4 | 9 | 7
Deferred policy acquisition costs and present value of future profits, foreign currency translation |  | 0 | 1 | (1) | 2
Deferred policy acquisition costs and present value of future profits, change in unrealized |  | 73 | (44) | 397 | (193)
Deferred policy acquisition costs and present value of future profits, ending balance |  | 1,669 | 1,119 | 1,669 | 1,119
P&C |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |
Deferred policy acquisition costs, beginning balance |  | 298 | 258 | 270 | 238
Deferred policy acquisition costs, additions |  | 181 | 149 | 524 | 439
Deferred policy acquisition costs, periodic amortization |  | (171) | (142) | (485) | (413)
Deferred policy acquisition costs, foreign currency translation |  | 0 | 1 | (1) | 2
Deferred policy acquisition costs, ending balance |  | 308 | 266 | 308 | 266
Annuity and Other |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |
Deferred policy acquisition costs, beginning balance |  | 1,243 | 1,167 | 1,217 | 1,110
Deferred policy acquisition costs, additions |  | 65 | 44 | 192 | 177
Deferred policy acquisition costs, periodic amortization |  | (58) | (44) | (193) | (122)
Deferred policy acquisition costs, annuity unlocking |  |  |  | 28 |
Deferred policy acquisition costs, change included in realized gains |  | 3 | 4 | 9 | 6
Deferred policy acquisition costs, ending balance |  | 1,253 | 1,171 | 1,253 | 1,171
Movement in Deferred Sales Inducements [Roll Forward] |  |  |  |  |
Deferred sales inducements, beginning balance |  | 94 | 103 | 102 | 110
Deferred sales inducements, additions |  | 1 | 1 | 2 | 3
Deferred sales inducements, periodic amortization |  | (5) | (4) | (15) | (14)
Deferred sales inducements, annuity unlocking |  |  |  | 1 |
Deferred sales inducements, change included in realized gains |  | 0 | 0 | 0 | 1
Deferred sales inducements, ending balance |  | 90 | 100 | 90 | 100
Movement in Present Value of Future Insurance Profits [Roll Forward] |  |  |  |  |
Present value of future profits, beginning balance |  | 45 | 42 | 49 | 46
Present value of future profits, periodic amortization |  | (2) | (2) | (6) | (6)
Present value of future profits, annuity unlocking |  |  |  | 0 |
Present value of future profits, ending balance |  | 43 | 40 | 43 | 40
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] | (98) | (414) | (422) | (265)
Unrealized investment gains (losses), change in unrealized | [1] | 73 | (44) | 397 | (193)
Unrealized investment gains (losses), ending balance | [1] | (25) | (458) | (25) | (458)
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 |  | 1,284 | 898 | 946 | 1,001
Deferred policy acquisition costs and present value of future profits, additions |  | 66 | 45 | 194 | 180
Deferred policy acquisition costs and present value of future profits, periodic amortization |  | (65) | (50) | (214) | (142)
Deferred policy acquisition costs and present value of future profits, annuity unlocking |  |  |  | 29 |
Deferred policy acquisition costs and present value of future profits, change included in realized gains |  | 3 | 4 | 9 | 7
Deferred policy acquisition costs and present value of future profits, change in unrealized |  | 73 | (44) | 397 | (193)
Deferred policy acquisition costs and present value of future profits, ending balance |  | 1,361 | 853 | 1,361 | 853
Excluding Unrealized Gains | Annuity and Other |  |  |  |  |
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 |  | 1,382 | 1,312 | 1,368 | 1,266
Deferred policy acquisition costs and present value of future profits, change in unrealized |  | 0 | 0 | 0 | 0
Deferred policy acquisition costs and present value of future profits, ending balance |  | $ 1,386 | $ 1,311 | $ 1,386 | $ 1,311
[1] | Unrealized adjustments to DPAC includes net unrealized gains/losses on securities and net unrealized gains/losses on cash flow hedges.

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