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Acquisitions and Divestitures - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2022 | Feb. 28, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Pre-tax gain on sale |  |  | $ 556,000,000 | $ 0 | $ 1,899,000,000 | $ 2,000,000 |  |
Goodwill |  |  | 34,444,000,000 |  | 34,444,000,000 |  |  | $ 3,506,000,000
Sale | LCD and Leveraged Loan Indices |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Sale of business in cash |  |  | 600,000,000 |  | 600,000,000 |  |  |
Contingent payment |  |  |  |  | 50,000,000 |  |  |
Pre-tax gain on sale |  |  | 518,000,000 |  | 38,000,000 |  |  |
Sale | LCD |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Pre-tax gain on sale |  |  | 518,000,000 |  |  |  |  |
Gain on disposition after tax |  |  | 396,000,000 |  |  |  |  |
Sale | Leveraged Loan Indices |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Pre-tax gain on sale |  |  |  |  | 38,000,000 |  |  |
Gain on disposition after tax |  |  |  |  | 31,000,000 |  |  |
Sale | Base Chemicals |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Sale of business in cash |  |  | 295,000,000 |  | 295,000,000 |  |  |
Sale | CUSIP Global Services |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Sale of business in cash |  |  |  |  |  |  | $ 1,925,000,000 |
Pre-tax gain on sale |  |  |  |  | 1,344,000,000 |  |  |
Gain on disposition after tax |  |  |  |  | 1,006,000,000.000 |  |  |
Sale | OPIS |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Sale of business in cash | $ 1,150,000,000 | $ 1,150,000,000 |  |  |  |  |  |
Pre-tax gain on sale |  | $ 0 |  |  |  |  |  |
Sale | SPIAS |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Pre-tax gain on sale |  |  |  |  |  | 2,000,000 |  |
Gain on disposition after tax |  |  |  |  |  | 2,000,000 |  |
IHS Markit |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 100.00% | 100.00% |  |  |  |  |  |
Number of S&P Global common stock transferred to IHS Markit stockholders (shares) | 113,800,453 |  |  |  |  |  |  |
Exchange ratio | 28.38% |  |  |  |  |  |  |
Fair value of the consideration transferred for IHS Markit | $ 43,536,000,000 | $ 43,536,000,000 |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes | 699,000,000 | 699,000,000 |  |  |  |  |  |
Acquisition-related costs |  |  | 135,000,000 | $ 50,000,000 | 379,000,000 | $ 99,000,000 |  |
Results of operations since acquisition date |  |  | 1,122,000,000 |  | 1,548,000,000 |  |  |
Operating profit since acquisition date |  |  | $ 196,000,000 |  | $ 249,000,000 |  |  |
Goodwill | 30,986,000,000 | 30,986,000,000 |  |  |  |  |  |
Other intangible assets | $ 19,162,000,000 | 19,162,000,000 |  |  |  |  |  |
IHS Markit | Replacement Equity Awards |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of S&P Global common stock transferred to IHS Markit stockholders (shares) | 900,000 |  |  |  |  |  |  |
Fair value of the consideration transferred for IHS Markit | $ 191,000,000 | $ 191,000,000 |  |  |  |  |  |

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