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DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) reporting_unit segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Number of reportable segments | segment | 1 |  |  |  |
Cumulative effect adjustment to opening retained earnings upon adoption | $ 607,000,000 | $ 475,000,000 | $ 375,000,000 |  | $ 206,000,000
Client deposits and other client liabilities | 134,000,000 | 44,000,000 |  |  |
Advance collection | 24,000,000 | 95,000,000 |  |  |
Maximum reimbursement per claim occurrence | $ 1,000,000 |  |  |  |
Plan years to be settled | 10 years |  |  |  |
Prepaid Insurance | $ 49,000,000 | 39,000,000 |  |  |
Weighted-average rate used in discounting the lease liabilities | 4.00% |  |  |  |
Accounts receivable allowance for doubtful accounts | $ 0 | 0 |  |  |
Number of reporting units | reporting_unit | 1 |  |  |  |
Impairment of goodwill | $ 0 | 0 | 0 |  |
Impairment of finite-lived intangible assets | 0 | 0 | 0 |  |
Advertising costs | 19,000,000 | 18,000,000 | 17,000,000 |  |
Bad debt expense net of recoveries | 1,000,000 | 0 | 0 |  |
Accumulated Deficit: |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Cumulative effect adjustment to opening retained earnings upon adoption | $ (144,000,000) | (219,000,000) | (266,000,000) |  | (377,000,000)
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit: |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Cumulative effect adjustment to opening retained earnings upon adoption |  | (1,000,000) | $ 0 |  | $ 2,000,000
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2014-09 | Accumulated Deficit: |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Cumulative effect adjustment to opening retained earnings upon adoption |  |  |  | $ 2,000,000 |
Minimum |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Estimated useful life of intangible assets | 1 year |  |  |  |
Minimum | Software Development |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Estimated useful life of intangible assets | 3 years |  |  |  |
Minimum | Software And Office Equipment |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Estimated useful life of property and equipment | 3 years |  |  |  |
Minimum | Furniture, fixtures, and equipment |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Estimated useful life of property and equipment | 5 years |  |  |  |
Maximum |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Estimated useful life of intangible assets | 10 years |  |  |  |
Maximum | Software Development |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Estimated useful life of intangible assets | 5 years |  |  |  |
Maximum | Software And Office Equipment |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Estimated useful life of property and equipment | 5 years |  |  |  |
Maximum | Furniture, fixtures, and equipment |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Estimated useful life of property and equipment | 7 years |  |  |  |
Non-US | Geographic Concentration Risk | Revenue |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Concentration risk percentage | 1.00% |  |  |  |
Health Care |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Prepaid Insurance | $ 58,000,000 | $ 52,000,000 |  |  |

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