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Pension Benefits	3 Months Ended
Pension Benefits	Jun. 30, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Pension Benefits	Pension Benefits The net periodic expense for our defined pension benefit plans was $6 million for the first quarters of 2018 and 2017. Cash contributions to these plans were $3 million and $4 million for the first quarters of 2018 and 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.