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Pension Plans and Other Postretirement Benefits - Fair Value of Pension Plan Assets (Details) - Pension Plan - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 6,677.0 $ 6,845.0 $ 6,395.0
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,566.0 2,291.0  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,837.0 3,231.0  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 378.0 343.0 354.0
Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5,781.0 5,865.0  
Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 60.0 118.0  
Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 97.0 81.0  
Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Cash and cash equivalents | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 157.0 199.0  
Debt securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,223.0 575.0  
Debt securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,330.0 2,887.0  
Debt securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Debt securities | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4,553.0 3,462.0  
U.S. government securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,223.0 575.0  
U.S. government securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.0 36.0  
U.S. government securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. government securities | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,224.0 611.0  
States, municipalities and political subdivisions | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
States, municipalities and political subdivisions | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 150.0 170.0  
States, municipalities and political subdivisions | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
States, municipalities and political subdivisions | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 150.0 170.0  
U.S. corporate securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. corporate securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,458.0 2,006.0  
U.S. corporate securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0 1.0
U.S. corporate securities | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2,458.0 2,006.0  
Foreign securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 202.0 167.0  
Foreign securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Foreign securities | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 202.0 167.0  
Residential mortgage-backed securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Residential mortgage-backed securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 277.0 287.0  
Residential mortgage-backed securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Residential mortgage-backed securities | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 277.0 287.0  
Commercial mortgage-backed securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Commercial mortgage-backed securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 76.0 83.0  
Commercial mortgage-backed securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Commercial mortgage-backed securities | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 76.0 83.0  
Other asset-backed securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Other asset-backed securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 162.0 133.0  
Other asset-backed securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Other asset-backed securities | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 162.0 133.0  
Redeemable preferred securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Redeemable preferred securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.0 5.0  
Redeemable preferred securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Redeemable preferred securities | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.0 5.0  
Equity securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 283.0 1,598.0  
Equity securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Equity securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Equity securities | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 283.0 1,598.0  
U.S. domestic | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 201.0 1,046.0  
U.S. domestic | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. domestic | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.S. domestic | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 201.0 1,046.0  
International | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 81.0 537.0  
International | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
International | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 81.0 537.0  
Domestic real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.0 15.0  
Domestic real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Domestic real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Domestic real estate | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.0 15.0  
Other investments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Other investments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 410.0 263.0  
Other investments | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 378.0 343.0  
Other investments | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 788.0 606.0  
Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 378.0 343.0 $ 353.0
Real estate | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 378.0 343.0  
Common/collective trusts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Common/collective trusts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 410.0 266.0  
Common/collective trusts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
Common/collective trusts | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 410.0 266.0  
Derivatives | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Derivatives | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   (3.0)  
Derivatives | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Derivatives | Total Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   (3.0)  
Common/collective trusts, Equity Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, investment within plan asset category, amount   84.0  
Common/collective trusts, Equity Securities | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, investment within plan asset category, amount 261.0    
Common/collective trusts, Debt Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, investment within plan asset category, amount   182.0  
Common/collective trusts, Debt Securities | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets, investment within plan asset category, amount 149.0    
Private equity investments | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 583.0 624.0  
Hedge fund investments | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 237.0 214.0  
Other receivables | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 76.0 $ 142.0