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Shareholders' Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Balance |  |  |  | $ 15,770 |
Net current-period other comprehensive income |  | $ (101) | $ 55 | (294) | $ 530
Balance |  | 13,978 |  | 13,978 |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |
Balance | [1] | (693) | (871) | (529) | (1,275)
Other comprehensive income | [1],[2] | (128) | 49 | (281) | 435
Equity method affiliates | [1],[3] |  | 4 | (11) | 22
Net current-period other comprehensive income | [1] | (128) | 53 | (292) | 457
Balance | [1] | $ (821) | $ (818) | (821) | (818)
Other Comprehensive Income, Tax |  |  |  | $ 28 | $ 47
[1] | All amounts are after tax. Amounts in parentheses indicate debits to accumulated other comprehensive loss.
[2] | For the three months ended September 30, 2018 and 2017, tax amounts are not significant. For the nine months ended September 30, 2018 and 2017, amounts are net of tax benefit of $28 million and tax expense of $47 million, respectively.
[3] | Tax effects are not significant.

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 + Details
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