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Taxation (Components Of Net Deferred Tax Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets, Gross [Abstract]    
Loss reserve discount $ 584 $ 715
Unearned premium reserve 471 231
Foreign tax credits 262 340
Provision for uncollectible balances 37 45
Loss carry-forwards 137 90
Debt related amounts 71 77
Compensation related amounts 263 260
Cumulative translation adjustments 43 30
Unrealized depreciation on investments 102 0
Other, net 95 70
Total deferred tax assets 2,065 1,858
Deferred Tax Liabilities, Gross [Abstract]    
Deferred policy acquisition costs 621 635
VOBA and other intangible assets 1,440 1,437
Un-remitted foreign earnings 47 66
Investments 59 53
Unrealized appreciation on investments 0 184
Depreciation 123 83
Deferred Tax Liabilities, Gross 2,290 2,458
Valuation allowance 79 99
Deferred Tax Liabilities, Net $ (304) $ (699)