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Taxation (Components Of Net Deferred Tax Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Loss reserve discount | $ 715 | $ 1,269
Unearned premium reserve | 231 | 498
Foreign tax credits | 340 | 2,115
Provision for uncollectible balances | 45 | 72
Loss carry-forwards | 90 | 92
Debt related amounts | 77 | 219
Compensation related amounts | 260 | 449
Cumulative translation adjustments | 30 | 59
Other, net | 70 | 69
Total deferred tax assets | 1,858 | 4,842
Deferred Tax Liabilities, Gross [Abstract] |  |
Deferred policy acquisition costs | 635 | 842
VOBA and other intangible assets | 1,437 | 2,352
Un-remitted foreign earnings | 66 | 2,001
Investments | 53 | 406
Unrealized appreciation on investments | 184 | 60
Depreciation | 83 | 91
Deferred Tax Liabilities, Gross | 2,458 | 5,752
Valuation allowance | 99 | 78
Deferred Tax Liabilities, Net | $ (699) | $ (988)

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