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Taxation (Reconciliation Of The Difference Between The Provision for Income Taxes and the Expected Tax Provision at Swiss Statutory Income Tax Rate) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
Expected tax provision at Swiss statutory rate $ 233 $ 160 $ 285
Taxes on earnings subject to rates other that Swiss statutory rate 129 323 327
Tax exempt interest and dividends received deduction, net of proration (24) (21) (20)
Net witholding taxes 23 19 15
Favorable resolution of prior years' tax matters and closing of statutes of limitations (124) 0 (21)
Change in valuation allowance 4 (2) (3)
Non-taxable acquisition gain 0 0 (61)
Other 29 23 31
Provision for income taxes $ 270 $ 502 $ 553