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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Table - Accrued Environmental Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Environmental Exit Cost [Line Items]
Document Period End Date	Sep. 30, 2019
Current	$ 46	$ 42
Non-current	276	295
Total environmental liabilities	$ 322	$ 337

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The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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