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Deferred Policy Acquisition Costs (Tables) | 3 Months Ended
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Mar. 31, 2019
Deferred Policy Acquisition Costs Disclosures [Abstract] |
Deferred Policy Acquisition Costs Details | A progression of deferred policy acquisition costs is presented below (in millions):
| P&C |  |  | Annuity and Other |  |  |
| Deferred |  |  | Deferred |  | Sales |  |  |  |  |  |  |  |  |  |  | Consolidated
| Costs |  |  | Costs |  | Inducements |  | PVFP |  | Subtotal |  | Unrealized (*) |  | Total |  |  | Total
Balance at December 31, 2018 | $ | 299 |  |  |  | $ | 1,285 |  |  | $ | 86 |  |  | $ | 42 |  |  | $ | 1,413 |  |  | $ | (30 | ) |  | $ | 1,383 |  |  |  | $ | 1,682 |
Additions | 187 |  |  |  | 64 |  |  | 1 |  |  | — |  |  | 65 |  |  | — |  |  | 65 |  |  |  | 252 |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic amortization | (175 | ) |  |  | (15 | ) |  | (3 | ) |  | (2 | ) |  | (20 | ) |  | — |  |  | (20 | ) |  |  | (195 | )
Included in realized gains | — |  |  |  | 2 |  |  | — |  |  | — |  |  | 2 |  |  | — |  |  | 2 |  |  |  | 2 |
Foreign currency translation | 1 |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 1 |
Change in unrealized | — |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (295 | ) |  | (295 | ) |  |  | (295 | )
Balance at March 31, 2019 | $ | 312 |  |  |  | $ | 1,336 |  |  | $ | 84 |  |  | $ | 40 |  |  | $ | 1,460 |  |  | $ | (325 | ) |  | $ | 1,135 |  |  |  | $ | 1,447 |
Balance at December 31, 2017 | $ | 270 |  |  |  | $ | 1,217 |  |  | $ | 102 |  |  | $ | 49 |  |  | $ | 1,368 |  |  | $ | (422 | ) |  | $ | 946 |  |  |  | $ | 1,216 |
Additions | 162 |  |  |  | 57 |  |  | — |  |  | — |  |  | 57 |  |  | — |  |  | 57 |  |  |  | 219 |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic amortization | (154 | ) |  |  | (69 | ) |  | (5 | ) |  | (2 | ) |  | (76 | ) |  | — |  |  | (76 | ) |  |  | (230 | )
Included in realized gains | — |  |  |  | 3 |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | 3 |  |  |  | 3 |
Foreign currency translation | 1 |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  | 1 |
Change in unrealized | — |  |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 208 |  |  | 208 |  |  |  | 208 |
Balance at March 31, 2018 | $ | 279 |  |  |  | $ | 1,208 |  |  | $ | 97 |  |  | $ | 47 |  |  | $ | 1,352 |  |  | $ | (214 | ) |  | $ | 1,138 |  |  |  | $ | 1,417 |
(*) | Adjustments to DPAC related to net unrealized gains/losses on securities and cash flow hedges.

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- Definition Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits Details [Table Text Block] + References No definition available. + Details
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration