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Employee Retirement Plans (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 19, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  | $ 506 | $ 466 |
Defined Benefit Plan, Benefit Obligation |  | (532) | (488) | $ (232)
Defined Benefit Plan, Plan Assets, Amount |  | 355 | 332 | 107
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position |  | 177 | 156 |
Defined Benefit Plan, Acquired and Established Plan Changes, Plan Assets |  | 0 | 213 |
Defined Benefit Plan, Acquired and Established Plan Changes, Plan Assets |  | 0 | 216 |
Defined Benefit Plan, Service Cost |  | 19 | 15 |
Defined Benefit Plan, Interest Cost |  | 5 | 5 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment |  | (5) | 11 |
pension benefit obligation, benefits paid |  | (23) | (10) |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) |  | 26 | 19 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) |  | 2 | 7 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 22 | 0 |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  | 12 | 13 |
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant |  | 2 | 2 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 14 | (20) |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | (23) | (10) |
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) |  | 16 | 19 |
Expense related to matching contributions |  | $ 102 | $ 98 | $ 87
Domestic Plan |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Executive Retirement Plan Discount Rate |  | 1.90% | 2.94% |
Executive Retirement Plan Rate of Compensation Increase |  | 1.50% | 1.50% |
U.K. Plan |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Assumptions used to Determine Expected Return |  | 0.10% | 0.60% |
Executive Retirement Plan Discount Rate |  | 0.10% | 0.60% |
Executive Retirement Plan Rate of Compensation Increase |  |  | 3.00% |
Other International Plans |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Assumptions used to Determine Expected Return |  | 1.98% | 2.05% |
Executive Retirement Plan Discount Rate |  | 0.67% | 0.75% |
Executive Retirement Plan Rate of Compensation Increase |  | 2.40% | 2.65% |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) |  | $ 7 |  |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) |  | 1 |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  | 15 |  |
Defined Benefit Plan, Benefit Obligation, Benefits Paid |  | (9) |  |
Other Contract |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 223 | $ 207 |
Other Contract | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 | 0 |
Other Contract | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 | 0 |
Other Contract | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 223 | 207 |
Defined Benefit Plan, Cash |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  | 1 |
Defined Benefit Plan, Cash | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  | 1 |
Defined Benefit Plan, Cash | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  | 0 |
Defined Benefit Plan, Cash | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  |  | 0 |
Executive retirement plan [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  | 54 | 50 |
Defined Benefit Plan, Benefit Obligation |  | (58) | (54) |
Defined Benefit Plan, Plan Assets, Amount |  | 0 | 0 |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position |  | 58 | 54 |
International retirement plans [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  | 225 | 204 |
Defined Benefit Plan, Benefit Obligation |  | (247) | (223) |
Defined Benefit Plan, Plan Assets, Amount |  | 132 | 123 |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position |  | 115 | 100 |
U.K. Plan |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Assets for Plan Benefits, Defined Benefit Plan | $ 213 |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation |  | 226 | 212 |
Defined Benefit Plan, Benefit Obligation | (216) | (226) | (212) |
Defined Benefit Plan, Plan Assets, Amount |  | 223 | 209 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | $ (3) |  |  |
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position |  | 3 | 3 |
Executive Retirement Plan Discount Rate | 0.40% |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 0.40% |  |  |
Executive Retirement Plan Rate of Compensation Increase | 3.40% |  |  |
U.K. Plan | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 | 1 |
U.K. Plan | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 | 0 |
U.K. Plan | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 223 | $ 207 |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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