Income Taxes (Policies)	9 Months Ended
Income Taxes (Policies)	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Tax, Policy [Policy Text Block]	For interim tax reporting, we estimate one single effective tax rate for tax jurisdictions not subject to a valuation allowance, which is applied to the year-to-date ordinary income/(loss). Tax effects of significant unusual or infrequently occurring items are excluded from the estimated annual effective tax rate calculation and recognized in the interim period in which they occur. During the third quarter, we recorded a tax benefit of $295 million, resulting from the reduction of valuation allowances recorded on various deferred tax assets. We believe future realization of these assets is now more likely than not as a result of tax planning actions implemented during the quarter.

Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.