Amendment Flag Dividends [Member] Dividends [Member] Change in value of prior years awards unvested at year-end [Member] Change in value of prior years awards unvested at year-end [Member] Deduction for amounts reported under column (e) in the SCT [Member] Deduction for amounts reported under column (e) in the SCT [Member] Fair value of current year equity awards at year-end [Member] Fair value of current year equity awards at year-end [Member] Deduction for change in the actuarial present values reported under column (h) of the SCT [Member] Deduction for change in the actuarial present values reported under column (h) of the SCT [Member] Deduction of value of prior years' awards that were forfeited during current year [Member] Deduction of value of prior years' awards that were forfeited during current year [Member] Fair value of current year equity awards that vested during current year [Member] Fair value of current year equity awards that vested during current year [Member] Entity Registrant Name Document Type Entity Central Index Key Change in value of prior years awards that vested during current year [Member] Change in value of prior years awards that vested during current year [Member] Deduction of value of prior years awards that were forfeited during year [Member] Deduction of value of prior years awards that were forfeited during year [Member] Cover [Abstract] Increase for Service Cost for Pension Plans [Member] Increase for Service Cost for Pension Plans [Member] Increase for Prior Service Cost for Pension Plans [Member] Increase for Prior Service Cost for Pension Plans [Member]