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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
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Expected tax provision at Swiss statutory rate | $ 411 | $ 365 | $ 291
Taxes on earnings subject to rates other that Swiss statutory rate | 376 | 372 | 263
Tax exempt interest and dividends received deduction, net of proration | (49) | (75) | (199)
Net witholding taxes | 40 | 33 | 30
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount | (12) | (19) | (48)
Income tax benefit related to 2017 Tax Act | 0 | (25) | (450)
Income Tax Reconciliation, Corporate Owned Life Insurance | (13) | 2 | (37)
Other | 42 | 42 | 11
Provision for income taxes | $ 795 | $ 695 | $ (139)

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117330312&loc=d3e23163-113944 + Details
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