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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Federal statutory rate | 35.00% | 21.00% | 21.00% | 24.50% | 35.00%
Unrecognized tax benefits that would impact effective tax rate |  |  | $ 124 |  |
Unrecognized tax benefits, income tax penalties and interest expense |  |  | 4 | $ 2 | $ (1)
Unrecognized tax benefits, income tax penalties and interest accrued |  | $ 23 | 27 | 23 |
Income taxes paid |  |  | 650 | 680 | 1,420
Net operating losses and tax credits |  | $ (396) | (407) | (396) |
Net income tax expense (benefit), tax reform | $ (43) |  | $ 0 | $ (189) | $ 0
Net income tax expense (benefit), tax reform, per diluted share | $ (0.07) |  |  | $ (0.30) |
Income tax expense (benefit), continuing operations, adjustment of deferred tax (asset) liability |  |  |  | $ (94) |
Income tax expense (benefit) due to repatriation of foreign earnings and withholding taxes |  |  |  | (35) |
Income tax benefit for repatriation of foreign earnings, prior periods |  |  |  | $ (130) |
Amount of net operating losses and tax credits expiring over the next 5 years |  |  | Approximately half |  |
Non-U.S. tax holiday tax rate reductions for certain foreign jurisdictions, expiration period in years |  |  | 3 years |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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