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Pension Benefits	9 Months Ended
	Dec. 31, 2017
Defined Benefit Plan [Abstract]
Pension Benefits	Pension Benefits The net periodic expense for our defined pension benefit plans was $6 million and $16 million for the third quarter and first nine months of 2018, and $8 million and $22 million for the third quarter and first nine months of 2017. Cash contributions to these plans were $5 million and $46 million for the third quarter and first nine months of 2018 and $6 million and $16 million for the third quarter and first nine months of 2017. The projected unit credit method is utilized in measuring net periodic pension expense over the employees’ service life for the pension plans. Unrecognized actuarial losses exceeding 10% of the greater of the projected benefit obligation or the market value of assets are amortized straight-line over the average remaining future service periods and expected life expectancy.

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- References

No definition available.

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- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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