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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - Schedule of Amounts Reclassified From AOCI By Component (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Tax Effect | $ (344,223) | $ (346,186) | $ (273,499)
Net Income Attributable to Common Shareholders | 1,220,527 | 1,205,167 | 909,053
Defined Benefit Plan Costs: |  |  |
Total Amounts Reclassified from AOCI, Net of Tax | (10,700) | (7,900) | (7,000)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Tax Effect | 700 | 900 | 1,100
Qualified Cash Flow Hedging Instruments, Net of Tax | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net Income Attributable to Common Shareholders | (1,000) | (1,600) | (1,400)
Amortization of Actuarial Losses |  |  |
Defined Benefit Plan Costs: |  |  |
Reclassifications from AOCI | (13,100) | (8,100) | (5,700)
Amortization of Prior Service Credit/(Cost) |  |  |
Defined Benefit Plan Costs: |  |  |
Reclassifications from AOCI | 0 | (300) | (1,800)
Defined Benefit Plans |  |  |
Defined Benefit Plan Costs: |  |  |
Reclassifications from AOCI | (13,100) | (8,400) | (7,500)
Tax Effect | 3,400 | 2,100 | 1,900
Total Amounts Reclassified from AOCI, Net of Tax | (9,700) | (6,300) | (5,600)
Interest Expense | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Qualified Cash Flow Hedging Instruments | $ (1,700) | $ (2,500) | $ (2,500)

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