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Employee Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Changes in Accumulated Postemployment Benefit Obligations
The following table shows the change in the accumulated postretirement benefit obligation ("APBO") for the years ended December 31, 2021 and 2020:
 
(in millions)20212020
APBO at beginning of period$428 $288 
Service cost25 22 
Interest cost10 10 
Benefits paid(24)(10)
Actuarial (gain)/loss(109)63 
Curtailment— 53 
Special termination benefits— 2 
APBO at end of period$330 $428 
Schedule of Amounts Recognized in Balance Sheet
The following table reconciles the funded status of the plans to the accrued postretirement benefit cost recognized in Other non-current liabilities on the Company’s Consolidated Balance Sheet at December 31, 2021 and 2020.
 
(in millions)20212020
Funded status$(330)$(428)
Unrecognized net actuarial (gain) loss(69)40 
Unrecognized prior service cost3 3 
Accumulated other comprehensive income (loss)66 (43)
Consolidated Balance Sheet liability$(330)$(428)
Schedule of Net Benefit Costs
The consolidated periodic postretirement benefit cost for the years ended December 31, 2021, 2020, and 2019, included the following:
 
(in millions)202120202019
Service cost$25 $22 $17 
Interest cost10 10 10 
Amortization of prior service cost— 1 1 
Amortization of net gain— — (2)
Curtailment— 53 — 
Special termination benefits— 2 — 
Net periodic postretirement benefit cost$35 $88 $26 
Schedule of Assumptions Used The following actuarial assumptions were used to account for the Company’s postretirement benefit plans at December 31, 2021, 2020, and 2019:
 
202120202019
Weighted-average discount rate2.90 %2.45 %3.30 %
Assumed healthcare cost trend rate (a)6.25 %6.75 %7.13 %
 
(a)The assumed healthcare cost trend rate is expected to be 6.25% for 2022, then decline gradually to 4.75% by 2028 and remain level thereafter.