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Postretirement Benefit Plans (Summary of Plan Assets, Benefit Obligation and Funded Status) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 246 $ 679  
Projected benefit obligation (513) (1,085)  
Unfunded status of the plans (267) (406)  
Amounts recognized in the balance sheet      
Other non-current assets 34 48  
Accrued and other current liabilities (15) (16)  
Accrued post-retirement benefit obligations (286) (438)  
Net amount recognized (267) (406)  
Accumulated other comprehensive income:      
Net actuarial losses (56) (343)  
Prior service credit 3 3  
Total (53) (340)  
Pension      
Defined Benefit Plan Disclosure      
Fair value of plan assets 246 679  
Projected benefit obligation (482) (1,043)  
Unfunded status of the plans (236) (364)  
Amounts recognized in the balance sheet      
Other non-current assets 34 48  
Accrued and other current liabilities (12) (13)  
Accrued post-retirement benefit obligations (258) (399)  
Net amount recognized (236) (364)  
Accumulated other comprehensive income:      
Net actuarial losses (50) (326)  
Prior service credit (1) (4)  
Total (51) (330)  
Other Benefits      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Projected benefit obligation (31) (42) $ (44)
Unfunded status of the plans (31) (42)  
Amounts recognized in the balance sheet      
Other non-current assets 0 0  
Accrued and other current liabilities (3) (3)  
Accrued post-retirement benefit obligations (28) (39)  
Net amount recognized (31) (42)  
Accumulated other comprehensive income:      
Net actuarial losses (6) (17)  
Prior service credit 4 7  
Total (2) (10)  
Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets 40 50  
Level 2      
Defined Benefit Plan Disclosure      
Fair value of plan assets 135 185  
Level 3      
Defined Benefit Plan Disclosure      
Fair value of plan assets 20 368 $ 384
NAV Practical Expedient      
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 51 $ 76