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Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Statutory income tax rate (as a percent) | 21.00% | 35.00% | 35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
U.S. statutory rate at 21%, 35% and 35% | $ 155 | $ 290 | $ 269
Tax on foreign income | 30 | (126) | (119)
U.S. taxes on foreign income, net of credits | 24 | 45 | 31
Valuation allowance changes | (1) | 9 | (14)
Tax contingencies | (2) | 6 | 11
Tax law changes | 4 | 174 | 3
Other items, net | 6 | 3 | 5
Total | $ 216 | $ 401 | $ 186

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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