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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, 2018	Dec. 31, 2017
Environmental Remediation Obligations [Abstract]
Current	$ 42	$ 35
Non-current	295	337
Total environmental liabilities	$ 337	$ 372

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.

+ References

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