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v3.21.1

Business Segments - Segment Revenues (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) segment | Mar. 31, 2020 USD ($)
Segment Reporting [Abstract] |  |
Number of operating segments | segment | 2 |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | $ 2,316 | $ 4,681
Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 2,112 | 4,452
Unallocated corporate and other |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 204 | 229
U.S. & Canada | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 1,721 | 3,820
International | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 391 | 632
Fee revenues |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Gross revenues | 445 | 629
Contract investment amortization | (17) | (25)
Revenues | 428 | 604
Fee revenues | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Gross revenues | 337 | 508
Contract investment amortization | (17) | (25)
Revenues | 320 | 483
Fee revenues | U.S. & Canada | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Gross revenues | 250 | 406
Contract investment amortization | (13) | (19)
Revenues | 237 | 387
Fee revenues | International | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Gross revenues | 87 | 102
Contract investment amortization | (4) | (6)
Revenues | 83 | 96
Owned, leased, and other |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 108 | 280
Owned, leased, and other | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 101 | 270
Owned, leased, and other | U.S. & Canada | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 35 | 102
Owned, leased, and other | International | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 66 | 168
Reimbursements |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 1,780 | 3,797
Reimbursements | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 1,691 | 3,699
Reimbursements | U.S. & Canada | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | 1,449 | 3,331
Reimbursements | International | Total segment |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Revenues | $ 242 | $ 368

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(b)(2)) -URI http://asc.fasb.org/extlink&oid=120399901&loc=d3e537907-122884 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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