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Employee Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2020
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 $102 million in 2020, $98 million in 2019 and $87 million in 2018.
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, 2020
(in millions)
Accumulated Benefit Obligation (ABO)Projected
Benefit
Obligation (PBO)		Fair value of Plan AssetsUnfunded/Underfunded
PBO Recognized
Domestic Retirement Plans$54 $58 $— $58 
U.K. Plan226 226 223 3 
Other International Retirement Plans225 247 132 115 
 $506 $532 $355 $177 

 As of December 31, 2019
(in millions)
Accumulated Benefit Obligation (ABO)Projected
Benefit
Obligation (PBO)		Fair value of Plan AssetsUnfunded/Underfunded PBO Recognized
Domestic Retirement Plans$50 $54 $— $54 
U.K. Plan212 212 209 3 
Other International Retirement Plans204 223 123 100 
 $466 $488 $332 $156 
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)20202019
Beginning obligations$488 $232 
Acquired plans— 216 
Service costs19 15 
Interest costs5 5 
Actuarial (gain) loss22 — 
Plan amendments and assumption changes(5)11 
Benefits paid(23)(10)
Impact of foreign currency fluctuations26 19 
Ending obligation$532 $488 
Schedule of Defined Benefit Plans Disclosures [Table Text Block] The following assumptions were used to measure the fair value of the benefit obligation and associated plan assets as of the August 19, 2019 measurement date:
Discount RateExpected Return on Plan AssetsRate of Compensation Increase
U.K. Plan0.4%0.4%3.4%

As of the measurement date of August 19, 2019, the funded status was as follows:
(in millions)
Fair value of plan assets$213 
Benefit obligation(216)
Funded status$(3)
The critical assumptions associated with our employee retirement plans for 2020 are as follows:
Weighted Average Discount RateWeighted Average Expected Return on Plan
Weighted Average Rate of Compensation Increase(1)
Domestic Retirement Plans1.90%n/a1.50%
U.K. Plan0.10%0.10%n/a
Other International Retirement Plans0.67%1.98%2.40%
(1)    Rates of compensation increase were not weighted by the relative fair value of the instruments. 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 2019 are as follows:
Weighted Average Discount RateWeighted Average Expected Return on Plan
Weighted Average Rate of Compensation Increase(1)
Domestic Retirement Plans2.94%n/a1.50%
U.K. Plan0.60%0.60%3.00%
Other International Retirement Plans0.75%2.05%2.65%
(1)    Rates of compensation increase were not weighted by the relative fair value of the instruments. As such, the amount represents the median of the inputs and is not a weighted average.
Schedule of Allocation of Plan Assets
The following table presents the fair value hierarchy of the U.K. Plan assets measured at fair value as of December 31, 2020:
As of
December 31, 2020
(in millions)Level 1Level 2Level 3Total
Buy-in contracts$— $— $223 $223 
Total assets$— $— $223 $223 

The following table presents the fair value hierarchy of the U.K. Plan assets measured at fair value as of December 31, 2019:
As of
As of December 31, 2019
(in millions)Level 1Level 2Level 3Total
Buy-in contracts$— $— $207 $207 
Cash1 — — 1 
Total assets$1 $— $207 $209 
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)20202019
Beginning fair value$332 $107 
Acquired plans— 213 
Actual return on plan assets2 7 
Employer contributions12 13 
Participant contributions2 2 
Actuarial gain (loss)14 (20)
Benefits paid(23)(10)
Impact of foreign currency fluctuations16 19 
Ending fair value$355 $332 
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, 2019$209 
Actual return on plan assets1 
Actuarial gain (loss)15 
Transfers out for benefits paid(9)
Impact of foreign currency fluctuations7 
Balance as of December 31, 2020$223