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Employee Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2022
Retirement Benefits [Abstract]  
Pension and Other Postretirement Plans, Policy [Policy Text Block] We also sponsor a voluntary 401(k) Retirement Savings Plan for eligible employees. We match 200 percent of employee elective deferrals for the first two percent of employee eligible compensation and 50 percent of employee elective deferrals greater than two percent, but not exceeding six percent, of employee eligible compensation. Total expense for our matching contributions to the plan was $123 million in 2022, $118 million in 2021 and $102 million in 2020.
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] The outstanding obligation is as follows:
 As of December 31, 2022
(in millions)
Accumulated Benefit Obligation (ABO)Projected
Benefit
Obligation (PBO)		Fair value of Plan AssetsUnfunded/Underfunded
PBO Recognized
Domestic Retirement Plans$50 $55 $— $55 
Other International Retirement Plans140 152 101 51 
 $190 $207 $101 $105 

 As of December 31, 2021
(in millions)
Accumulated Benefit Obligation (ABO)Projected
Benefit
Obligation (PBO)		Fair value of Plan AssetsUnfunded/Underfunded PBO Recognized
Domestic Retirement Plans$56 $59 $— $59 
U.K. Plan209 209 205 3 
Other International Retirement Plans214 234 130 103 
 $478 $502 $336 $166 
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
A rollforward of the changes in the PBO for our retirement plans is as follows:
 Year Ended December 31,
(in millions)20222021
Beginning obligations$502 $532 
Acquired plans— 4 
Service costs13 17 
Interest costs3 3 
Actuarial (gain) loss(54)(7)
Plan curtailments/settlements(191)— 
Plan amendments and assumption changes(25)(6)
Benefits paid(6)(22)
Impact of foreign currency fluctuations(37)(20)
Ending obligation$207 $502 
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The critical assumptions associated with our employee retirement plans for 2022 are as follows:
Weighted Average Discount RateWeighted Average Expected Return
Weighted Average Rate of Compensation Increase(1)
Domestic Retirement Plans5.32%n/a2.00%
Other International Retirement Plans2.62%2.27%3.00%
(1)    Rates of compensation increase were not weighted by relative fair value. As such, the amount represents the median of the inputs and is not a weighted average.
The critical assumptions associated with our employee retirement plans for 2021 are as follows:
Weighted Average Discount RateWeighted Average Expected Return
Weighted Average Rate of Compensation Increase(1)
Domestic Retirement Plans2.40%n/a1.50%
U.K. Plan0.70%0.70%n/a
Other International Retirement Plans0.82%2.16%2.60%
(1)    Rates of compensation increase were not weighted by relative fair value. As such, the amount represents the median of the inputs and is not a weighted average.
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] A rollforward of the changes in the fair value of plan assets for our funded retirement plans is as follows:
 Year Ended December 31,
(in millions)20222021
Beginning fair value$336 $355 
Acquired plans— 1 
Actual return on plan assets(2)5 
Employer contributions16 12 
Participant contributions1 2 
Plan curtailments/settlements(185)— 
Actuarial gain (loss)(25)(4)
Benefits paid(9)(22)
Impact of foreign currency fluctuations(32)(13)
Ending fair value$101 $336 
Prior to the transfer, the U.K. Plan utilized the insurance buy-in methodology and based its discount rate on a yield curve reflective of the market pricing obtained in the most recent buy-in transaction, which occurred prior to the acquisition of BTG, and movements in market-observed buy-in pricing as of December 31, 2021. We believed this to be a reasonable proxy for an effective settlement rate of the buy-in assets. The discount rate was calculated as the single equivalent assumption that gives the same value of the liabilities as if the figures were calculated using the full yield curve. We assumed that all pension increases would continue to be linked to the Retail Price Inflation (RPI), both before and after retirement, for all members, with the exception of post-88 Guaranteed Minimum Pensions (GMP), which would be based on Consumer Price Inflation (CPI). We based our rate of expected return on plan assets as equal to the discount rate used to value the buy-in assets. The U.K. Plan assets' investment policy was to invest in fully matching assets. This was achieved through the purchase of two buy-in policies (Buy-in contracts), which provided payments designed to equal all future benefit payments due from the fund. As of December 31, 2021, the Buy-in contracts represented 100 percent of the total plan assets, as compared to the target percentage of 100 percent, and are considered Level 3 investments.

The following table presents the fair value hierarchy of the U.K. Plan assets measured at fair value:
As of
December 31, 2021
(in millions)Level 1Level 2Level 3Total
Buy-in contracts$— $— $205 $205 
Total assets$— $— $205 $205 
Changes in the fair value of the U.K. Plan Level 3 assets were as follows:
(in millions)Buy-in Contracts
Balance as of December 31, 2021$205 
Actual return on plan assets0 
Employer contributions1 
Plan curtailments/settlements(160)
Actuarial gain (loss)(24)
Benefits paid(2)
Impact of foreign currency fluctuations(22)
Balance as of December 31, 2022$— 
Schedule of Expected Benefit Payments Benefit payments expected to be paid during the next ten years for our Domestic Retirement Plans and our Other International Retirement Plans are as follows:
(in millions)Post Retirement Benefits
2023$15 
20248 
202513 
202614 
202714 
2028 - 203270