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Deferred Policy Acquisition Costs - Progression of deferred policy acquisition costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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 |  | $ 1,417 | $ 1,205 | $ 1,216 | $ 1,239
Deferred policy acquisition costs and present value of future profits, additions |  | 252 | 218 | 471 | 425
Deferred policy acquisition costs and present value of future profits, periodic amortization |  | (233) | (178) | (463) | (363)
Deferred policy acquisition costs and present value of future profits, annuity unlocking |  | 29 |  | 29 |
Deferred policy acquisition costs and present value of future profits, change included in realized gains |  | 3 | 1 | 6 | 3
Deferred policy acquisition costs and present value of future profits, foreign currency translation |  | (2) | 0 | (1) | 1
Deferred policy acquisition costs and present value of future profits, change in unrealized |  | 116 | (90) | 324 | (149)
Deferred policy acquisition costs and present value of future profits, ending balance |  | 1,582 | 1,156 | 1,582 | 1,156
P&C |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |
Deferred policy acquisition costs, beginning balance |  | 279 | 243 | 270 | 238
Deferred policy acquisition costs, additions |  | 181 | 151 | 343 | 290
Deferred policy acquisition costs, periodic amortization |  | (160) | (136) | (314) | (271)
Deferred policy acquisition costs, foreign currency translation |  | (2) | 0 | (1) | 1
Deferred policy acquisition costs, ending balance |  | 298 | 258 | 298 | 258
Annuity and Other |  |  |  |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |  |  |  |
Deferred policy acquisition costs, beginning balance |  | 1,208 | 1,137 | 1,217 | 1,110
Deferred policy acquisition costs, additions |  | 70 | 66 | 127 | 133
Deferred policy acquisition costs, periodic amortization |  | (66) | (36) | (135) | (78)
Deferred policy acquisition costs, annuity unlocking |  | 28 |  | 28 |
Deferred policy acquisition costs, change included in realized gains |  | 3 | 0 | 6 | 2
Deferred policy acquisition costs, ending balance |  | 1,243 | 1,167 | 1,243 | 1,167
Movement in Deferred Sales Inducements [Roll Forward] |  |  |  |  |
Deferred sales inducements, beginning balance |  | 97 | 105 | 102 | 110
Deferred sales inducements, additions |  | 1 | 1 | 1 | 2
Deferred sales inducements, periodic amortization |  | (5) | (4) | (10) | (10)
Deferred sales inducements, annuity unlocking |  | 1 |  | 1 |
Deferred sales inducements, change included in realized gains |  | 0 | 1 | 0 | 1
Deferred sales inducements, ending balance |  | 94 | 103 | 94 | 103
Movement in Present Value of Future Insurance Profits [Roll Forward] |  |  |  |  |
Present value of future profits, beginning balance |  | 47 | 44 | 49 | 46
Present value of future profits, periodic amortization |  | (2) | (2) | (4) | (4)
Present value of future profits, annuity unlocking |  | 0 |  | 0 |
Present value of future profits, ending balance |  | 45 | 42 | 45 | 42
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] | (214) | (324) | (422) | (265)
Unrealized investment gains (losses), change in unrealized | [1] | 116 | (90) | 324 | (149)
Unrealized investment gains (losses), ending balance | [1] | (98) | (414) | (98) | (414)
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 |  | 1,138 | 962 | 946 | 1,001
Deferred policy acquisition costs and present value of future profits, additions |  | 71 | 67 | 128 | 135
Deferred policy acquisition costs and present value of future profits, periodic amortization |  | (73) | (42) | (149) | (92)
Deferred policy acquisition costs and present value of future profits, annuity unlocking |  | 29 |  | 29 |
Deferred policy acquisition costs and present value of future profits, change included in realized gains |  | 3 | 1 | 6 | 3
Deferred policy acquisition costs and present value of future profits, change in unrealized |  | 116 | (90) | 324 | (149)
Deferred policy acquisition costs and present value of future profits, ending balance |  | 1,284 | 898 | 1,284 | 898
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 |  | 1,352 | 1,286 | 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 |  | $ 1,382 | $ 1,312 | $ 1,382 | $ 1,312
[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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