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Divestitures - Narrative (Details) € in Millions, £ in Millions, $ in Millions, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2020 USD ($) | Oct. 31, 2020 USD ($) | Oct. 31, 2020 GBP (£) | Oct. 31, 2020 AUD ($) | Oct. 31, 2020 EUR (€) | Dec. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2020 AUD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of businesses |  |  |  |  |  | $ 2,046 |  |  | $ 0 | $ 2,046 | $ 0
Repayments of debt |  | $ 3,500 |  |  |  |  |  |  |  | 2,926 | $ 1,029
Commercial paper |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 772 | £ 600 |  |  |  |  |  |  |  |
Term loan |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | 1,441 |  |  |  |  |
Term loan | Term Loan Payable, EUR, Due 2023-2024 |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 410 |  |  | € 350 |  |  |  |  |  |
Term loan | Term Loan Payable, USD, Due 2025 |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 381 |  |  |  |  | $ 100 |  |  |  |
Term loan | Term Loan Payable, AUD, Due 2022 |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 358 |  | $ 500 |  |  |  | $ 300 |  |  |
Term loan | Term Loan Payable, EUR, Due 2022-2023 |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | 292 |  |  | € 250 |  |  |  |  |  |
Revolving credit facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 1,250 |  |  |  |  |  |  |  | $ 4,000 |
HHS Business |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Transaction consideration | $ 5,000 |  |  |  |  |  |  |  |  |  |
Portion of consideration related to future services to be provided | 85 |  |  |  |  |  |  |  |  |  |
Gain on disposition of businesses | $ 2,041 |  |  |  |  |  |  |  |  |  |
HHS Business | Milano Purchasers |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Commercial accounts receivable transferred |  |  |  |  |  | 272 |  |  |  |  |
Prepaid maintenance transferred |  |  |  |  |  | 12 |  |  |  |  |
Software licenses transferred |  |  |  |  |  | 48 |  |  |  |  |
Individually Insignificant Disposal Group |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of businesses |  |  |  |  |  | $ 5 |  |  |  |  |

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