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Employee Benefit Plans - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) investment_pool | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to defined contribution plans | $ 38 | $ 65 | $ 44
Employer contribution (as percent) | 100.00% |  |
Employee contribution (as percent) | 1.00% |  |
Employer contribution (as percent) | 25.00% |  |
Employer contribution (as percent) | 4.00% |  |
U.S. and other plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company contribution | $ 5 | 0 |
Plan assets investments | $ 181 | 167 | 0
U.S. and other plans | On-risk assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets target allocation percentage | 50.00% |  |
U.S. and other plans | Off-risk assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets target allocation percentage | 50.00% |  |
U.K. plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company contribution | $ 0 | 0 |
Number of plan asset investment pools | investment_pool | 2 |  |
Plan assets investments | $ 974 | 860 | $ 0
U.K. plan | On-risk assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets target allocation percentage | 50.00% |  |
U.K. plan | Off-risk assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets target allocation percentage | 50.00% |  |
Fair Value Measured at Net Asset Value Per Share | Hedge funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets investments | $ 227 | $ 48 |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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