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Income Taxes Changes in Tax Legislation and Statutory Tax Rate (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Change in Tax Legislation and Statutory Tax Rates [Line Items]
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	$ 30	$ (76)		$ (70)	$ (284)	$ 31
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount				0	0	108
Income tax provision				$ (108)	$ 233	$ (197)
US statutory tax rate					12.50%	12.50%
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)
United States
Change in Tax Legislation and Statutory Tax Rates [Line Items]
US statutory tax rate						21.00%
US Statutory Income Tax Rate, Blended						24.50%

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US Statutory Income Tax Rate, Blended

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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