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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 | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Expected tax provision at Swiss statutory rate | $ 291 | $ 388 | $ 258
Taxes on earnings subject to rates other that Swiss statutory rate | 263 | 582 | 193
Tax exempt interest and dividends received deduction, net of proration | (199) | (200) | (32)
Net witholding taxes | 30 | 20 | 35
Change in valuation allowance | (48) | 0 | 0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | (450) |  |
Income tax benefit related to 2017 Tax Act | (450) | 0 | 0
Income Tax Reconciliation, Non-taxable Acquisition Gain | (37) | 0 | 0
Other | 11 | 25 | 8
Provision for income taxes | $ (139) | $ 815 | $ 462

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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