Taxation (Components Of Net Deferred Tax Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets, Gross [Abstract]
Loss reserve discount	$ 807	$ 849
Unearned premium reserve	93	98
Foreign tax credits	1,236	1,131
Investments	3	43
Provision for uncollectible balances	78	110
Loss carry-forwards	54	55
Other, net	184	110
Total deferred tax assets	2,455	2,396
Deferred Tax Liabilities, Gross [Abstract]
Deferred policy acquisition costs	138	68
VOBA and other intangible assets	351	379
Un-remitted foreign earnings	982	795
Unrealized appreciation on investments	210	586
Deferred Tax Liabilities, Unrealized Currency Transaction Gains	94	59
Total deferred tax liabilities	1,775	1,887
Valuation allowance	64	56
Net deferred tax assets	$ 616	$ 453