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Taxation (Provision For Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Examination [Line Items] |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic | $ 950 | $ 527 | $ 766
Income (Loss) from Continuing Operations before Income Taxes, Foreign | 3,707 | 3,195 | 4,184
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | 4,657 | 3,722 | 4,950
Current tax expense | 652 | 359 | 824
Deferred tax expense | 43 | (498) | (9)
Provision for income taxes | 695 | (139) | 815
Domestic Tax Authority [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Current tax expense | 89 | 46 | 97
Deferred tax expense | 3 | 2 | (27)
Foreign Tax Authority [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Current tax expense | 563 | 313 | 727
Deferred tax expense | $ 40 | $ (500) | $ 18

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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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