Actuarial Present Value of Pension Benefits Attributable to Service [Member] Actuarial present value of pension benefits attributable to service. Aggregate Change in Actuarial Present Value of Pension Benefits [Member] Aggregate change in actuarial present value of pension benefits. Dollar Value of Dividends or Earnings Paid on Equity Awards not Otherwise Included in Total Compensation [Member] Dollar value of dividends or earnings paid on equity awards not otherwise included in total compensation. Fair Value as of Vesting Date of Equity Awards Granted and Vested in Year [Member] Fair value as of vesting date of equity awards granted and vested in year. Fair Value at the End of the Prior Year of Equity Awards that Fail to Meet Vesting Conditions [Member] Fair value at the end of the prior year of equity awards that fail to meet vesting conditions. Fair Value at Year End of Outstanding and Unvested Equity Awards Granted in Year [Member] Fair value at year end of outstanding and unvested equity awards granted in year. Grant Date Fair Value of Stock and Option Awards [Member] Grant date fair value of stock and option awards. Year over Year Change in Fair Value of Equity Awards Granted in Prior Years that Vested in Year [Member] Year over year change in fair value of equity awards granted in prior years that vested in year. Year over Year Change in Fair Value of Outstanding and Unvested Equity Awards [Member] Year over year change in fair value of outstanding and unvested equity award.