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Income Taxes Changes in Tax Legislation and Statutory Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Change in Tax Legislation and Statutory Tax Rates [Line Items]
Income tax provision				$ (518)	$ (705)	$ (197)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount				108	$ 0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 139		$ 101
Remeasurement of U.S. deferred tax assets and liabilities [Member]
Change in Tax Legislation and Statutory Tax Rates [Line Items]
Income tax provision		$ 101		108
Transition Tax on Deemed Repatriated Earnings [Member]
Change in Tax Legislation and Statutory Tax Rates [Line Items]
Income tax provision		$ 305		$ 216
Earliest Tax Year [Member]
Change in Tax Legislation and Statutory Tax Rates [Line Items]
Tax Credit Carryforward, Expiration Date				Dec. 31, 2020
Latest Tax Year [Member]
Change in Tax Legislation and Statutory Tax Rates [Line Items]
Tax Credit Carryforward, Expiration Date				Dec. 31, 2024

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[Line Items] for Change in Tax Legislation and Statutory Tax Rates [Table]

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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-Name Accounting Standards Codification
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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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