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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Regulatory Matters, Commitments, Contingencies And Environemental Liabilities (Environmental Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Environmental Remediation Obligations [Abstract]
Current	$ 44	$ 46
Non-current	262	274
Total environmental liabilities	$ 306	$ 320

X

- Definition

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

+ References

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- Definition

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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