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Retirement Plans and Other Retiree Benefits - Allocation of Plan Assets and Level of Valuation Input, by Major Asset Category (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Percent of fixed income assets invested in US treasury or agency securities 50.00% 50.00%  
Other assets and liabilities, net      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   $ 0  
Other Retiree Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 3 37 $ 54
Other Retiree Benefit Plans | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 24  
Other Retiree Benefit Plans | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 13  
Other Retiree Benefit Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 1  
Other Retiree Benefit Plans | U.S. common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 1  
Other Retiree Benefit Plans | International common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Retiree Benefit Plans | Pooled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 2  
Other Retiree Benefit Plans | Fixed income securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 20  
Other Retiree Benefit Plans | Guaranteed investment contracts | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Retiree Benefit Plans | Domestic, developed and emerging markets equity funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 7  
Other Retiree Benefit Plans | Fixed income funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 3  
Other Retiree Benefit Plans | Hedge funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other Retiree Benefit Plans | Multi-Asset funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 2  
Other Retiree Benefit Plans | Real estate funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 1  
Other Retiree Benefit Plans | Other assets and liabilities, net      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0    
United States | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,921 1,806 1,568
United States | Pension Plans | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,233 1,187  
United States | Pension Plans | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 703 704  
United States | Pension Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 50 41  
United States | Pension Plans | U.S. common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 49  
United States | Pension Plans | International common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
United States | Pension Plans | Pooled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 65 29  
United States | Pension Plans | Fixed income securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,117 1,067  
United States | Pension Plans | Guaranteed investment contracts | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
United States | Pension Plans | Domestic, developed and emerging markets equity funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 456 328  
United States | Pension Plans | Fixed income funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 136 177  
United States | Pension Plans | Hedge funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 3  
United States | Pension Plans | Multi-Asset funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 77 155  
United States | Pension Plans | Real estate funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 34 41  
United States | Pension Plans | Other assets and liabilities, net      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets (15) (85)  
International | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 698 586 $ 510
International | Pension Plans | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 252 181  
International | Pension Plans | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 446 405  
International | Pension Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 12 15  
International | Pension Plans | U.S. common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 3  
International | Pension Plans | International common stocks | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 3  
International | Pension Plans | Pooled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 117 104  
International | Pension Plans | Fixed income securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 59 14  
International | Pension Plans | Guaranteed investment contracts | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 55 42  
International | Pension Plans | Domestic, developed and emerging markets equity funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 183 165  
International | Pension Plans | Fixed income funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 225 196  
International | Pension Plans | Hedge funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6 17  
International | Pension Plans | Multi-Asset funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 2 2  
International | Pension Plans | Real estate funds | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 30 25  
International | Pension Plans | Other assets and liabilities, net      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0