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, 2021 | Dec. 31, 2020 | Dec. 31, 2019 |
Defined Benefit Plan Disclosure [Line Items] | | | |
Percent of fixed income assets invested in US treasury or agency securities | 40.00% | 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 | $ 0 | 3 | $ 37 |
Other Retiree Benefit Plans | Fair Value, Inputs, Level 1, 2 and 3 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 2 | |
Other Retiree Benefit Plans | 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 | Cash and cash equivalents | Fair Value, Inputs, Level 1 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 0 | |
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 | 0 | |
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 | 0 | |
Other Retiree Benefit Plans | Fixed income securities | Fair Value, Inputs, Level 2 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 0 | 2 | |
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 | 0 | 1 | |
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 | 0 | |
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 | 0 | |
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 | 0 | |
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 | 1,834 | 1,921 | 1,806 |
United States | Pension Plans | Fair Value, Inputs, Level 1, 2 and 3 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 992 | 1,233 | |
United States | Pension Plans | Fair Value Measured at Net Asset Value Per Share | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 856 | 703 | |
United States | Pension Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 38 | 50 | |
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 | 0 | |
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 | 48 | 65 | |
United States | Pension Plans | Fixed income securities | Fair Value, Inputs, Level 2 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 905 | 1,117 | |
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 | 361 | 456 | |
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 | 469 | 136 | |
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 | 0 | |
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 | 26 | 77 | |
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 | 0 | 34 | |
United States | Pension Plans | Other assets and liabilities, net | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | (14) | (15) | |
International | Pension Plans | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 723 | 698 | $ 586 |
International | Pension Plans | Fair Value, Inputs, Level 1, 2 and 3 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 258 | 252 | |
International | Pension Plans | Fair Value Measured at Net Asset Value Per Share | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 465 | 446 | |
International | Pension Plans | Cash and cash equivalents | Fair Value, Inputs, Level 1 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 9 | 12 | |
International | Pension Plans | U.S. common stocks | Fair Value, Inputs, Level 1 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 2 | 1 | |
International | Pension Plans | International common stocks | Fair Value, Inputs, Level 1 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 13 | 8 | |
International | Pension Plans | Pooled funds | Fair Value, Inputs, Level 1 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 116 | 117 | |
International | Pension Plans | Fixed income securities | Fair Value, Inputs, Level 2 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 67 | 59 | |
International | Pension Plans | Guaranteed investment contracts | Fair Value, Inputs, Level 2 | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | 51 | 55 | |
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 | 97 | 183 | |
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 | 328 | 225 | |
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 | 8 | 6 | |
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 | 30 | |
International | Pension Plans | Other assets and liabilities, net | | | |
Defined Benefit Plan Disclosure [Line Items] | | | |
Fair value of plan assets | $ 0 | $ 0 | |