v3.22.0.1
Pension and Other Postretirement Benefits - Benefit Obligation and Funded Status (Details) - USD ($)
 1 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Apr. 01, 2020
Jan. 01, 2020
Amounts recognized on the Consolidated Balance Sheet:              
Noncurrent assets           $ 65,000,000  
Noncurrent liabilities           $ (15,000,000)  
United States              
Amounts recognized on the Consolidated Balance Sheet:              
Current liabilities             $ (60,000,000)
Pension benefits​              
Change in benefit obligation              
Benefit obligation at beginning of year     $ 4,081,000,000 $ 142,000,000      
Establishment of additional defined benefit plans - New Direct Plans     0 3,688,000,000      
Separation-related adjustments - Additional New Direct Plans     0 550,000,000      
Service cost     21,000,000 21,000,000 $ 3,000,000    
Interest cost     63,000,000 108,000,000 4,000,000    
Amendments     0 0      
Actuarial losses     (105,000,000) 382,000,000      
Benefits paid     (183,000,000) (273,000,000)      
Settlements     (1,051,000,000) (542,000,000)      
Foreign currency translation impact     (9,000,000) 10,000,000      
Divestitures     0 (5,000,000)      
Medicare part D subsidy receipts     0 0      
Benefit obligation at end of year   $ 4,081,000,000 2,817,000,000 4,081,000,000 142,000,000    
Change in plan assets              
Fair value of plan assets at beginning of year     2,754,000,000 79,000,000      
Establishment of additional defined benefit plans - New Direct Plans     0 2,335,000,000      
Separation-related adjustments - Additional New Direct Plans     0 600,000,000      
Actual return on plan assets     177,000,000 350,000,000      
Employer contributions     458,000,000 271,000,000      
Benefits paid     (176,000,000) (266,000,000)      
Settlements     (1,069,000,000) (595,000,000)      
Foreign currency translation impact     (3,000,000) 3,000,000      
Divestitures     0 (4,000,000)      
Administrative expenses     (17,000,000) (19,000,000)      
Fair value of plan assets at end of year   2,754,000,000 2,124,000,000 2,754,000,000 79,000,000    
Funded status   1,327,000,000 693,000,000 1,327,000,000      
Amounts recognized on the Consolidated Balance Sheet:              
Noncurrent assets   24,000,000 32,000,000 24,000,000      
Current liabilities   (8,000,000) (8,000,000) (8,000,000)      
Noncurrent liabilities   (1,343,000,000) (717,000,000) (1,343,000,000)      
Net amount recognized   (1,327,000,000) (693,000,000) (1,327,000,000)      
Amounts recognized in Accumulated Other Comprehensive Loss (pretax):              
Net actuarial loss   2,204,000,000 1,389,000,000 2,204,000,000      
Prior service benefit   0   0      
Net amount recognized   2,204,000,000 1,389,000,000 2,204,000,000      
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Income (pretax):              
Net actuarial loss     (137,000,000) 276,000,000      
Prior service benefit     0 0      
Amortization of prior service benefit     0 0      
Amortization of net actuarial loss     (678,000,000) (322,000,000)      
Total     (815,000,000) (46,000,000)      
Actuarial loss attributable to change in discount rate used to determine benefit obligation     (130,000,000) 370,000,000      
Pension benefits​ | United States              
Change in benefit obligation              
Benefit obligation at beginning of year     3,646,000,000        
Settlements $ 995,000,000 240,000,000          
Benefit obligation at end of year 3,337,000,000 3,646,000,000 2,398,000,000 3,646,000,000      
Change in plan assets              
Fair value of plan assets at beginning of year     2,379,000,000        
Employer contributions 250,000,000            
Fair value of plan assets at end of year $ 2,790,000,000 2,379,000,000 1,744,000,000 2,379,000,000      
Funded status   1,267,000,000 654,000,000 1,267,000,000      
Other postretirement benefits              
Change in benefit obligation              
Benefit obligation at beginning of year     514,000,000 1,000,000      
Establishment of additional defined benefit plans - New Direct Plans     0 567,000,000      
Separation-related adjustments - Additional New Direct Plans     0 0      
Service cost     6,000,000 5,000,000      
Interest cost     11,000,000 13,000,000      
Amendments     (30,000,000) (52,000,000)      
Actuarial losses     (23,000,000) 33,000,000      
Benefits paid     (38,000,000) (55,000,000)      
Settlements     0 0      
Foreign currency translation impact     0 0      
Divestitures     0 0      
Medicare part D subsidy receipts     0 2,000,000      
Benefit obligation at end of year   514,000,000 440,000,000 514,000,000 1,000,000    
Change in plan assets              
Fair value of plan assets at beginning of year     0 0      
Establishment of additional defined benefit plans - New Direct Plans     0 0      
Separation-related adjustments - Additional New Direct Plans     0 0      
Actual return on plan assets     0 0      
Employer contributions     0 0      
Benefits paid     0 0      
Settlements     0 0      
Foreign currency translation impact     0 0      
Divestitures     0 0      
Administrative expenses     0 0      
Fair value of plan assets at end of year   0 0 0 $ 0    
Funded status   514,000,000 440,000,000 514,000,000      
Amounts recognized on the Consolidated Balance Sheet:              
Noncurrent assets   0 0 0      
Current liabilities   (35,000,000) (29,000,000) (35,000,000)      
Noncurrent liabilities   (479,000,000) (411,000,000) (479,000,000)      
Net amount recognized   (514,000,000) (440,000,000) (514,000,000)      
Amounts recognized in Accumulated Other Comprehensive Loss (pretax):              
Net actuarial loss   197,000,000 166,000,000 197,000,000      
Prior service benefit   (61,000,000) (85,000,000) (61,000,000)      
Net amount recognized   $ 136,000,000 81,000,000 136,000,000      
Other changes in plan assets and benefit obligations recognized in Other Comprehensive Income (pretax):              
Net actuarial loss     (23,000,000) 35,000,000      
Prior service benefit     (30,000,000) (52,000,000)      
Amortization of prior service benefit     6,000,000 4,000,000      
Amortization of net actuarial loss     (8,000,000) (8,000,000)      
Total     $ (55,000,000) $ (21,000,000)