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Acquisitions and Divestitures - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 02, 2023 | Jun. 30, 2022 | Feb. 28, 2022 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on sale |  |  |  | $ 0 |  | $ (2,000,000) | $ (69,000,000) | $ 1,897,000,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Engineering Solutions Segment |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Divestiture consideration | $ 975,000,000 |  |  |  |  |  |  |  |
Proceeds from divestiture of business | 750,000,000 |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Engineering Solutions Business |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Divestiture consideration | 975,000,000 |  |  |  |  |  |  |  |
Proceeds from divestiture of business | $ 750,000,000 |  |  |  |  |  |  |  |
Pre-tax gain (loss) on sale |  |  |  |  |  |  | (120,000,000) |  |
Disposition related costs |  |  |  |  |  |  | 16,000,000 |  |
Gain (loss) on disposition after tax |  |  |  |  |  |  | (182,000,000) |  |
Release of deferred tax liabilities |  |  |  |  |  |  | 157,000,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | LCD |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on sale |  |  |  |  |  | (15,000,000) |  | 505,000,000 |
Gain (loss) on disposition after tax |  |  |  |  |  | (11,000,000) |  | 378,000,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | LCD | Market Intelligence |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on sale |  |  |  |  |  |  | 46,000,000 |  |
Gain (loss) on disposition after tax |  |  |  |  |  |  | 34,000,000 |  |
Contingent payment due following closing, period |  |  |  |  | 6 months |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | LCD | Indices |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on sale |  |  |  |  |  |  | 4,000,000 |  |
Gain (loss) on disposition after tax |  |  |  |  |  |  | $ 3,000,000 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Leveraged Commentary And Data And Leveraged Loan Indices |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Divestiture consideration |  | $ 600,000,000 |  |  |  |  |  |  |
Contingent payment |  | $ 50,000,000 |  |  |  |  |  |  |
Contingent consideration, maximum period until achieved consideration is payable |  | 6 months |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Leveraged Loan Indices |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on sale |  |  |  |  |  | 14,000,000 |  | 52,000,000 |
Gain (loss) on disposition after tax |  |  |  |  |  | 12,000,000 |  | 43,000,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Base Chemicals |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Divestiture consideration |  | $ 295,000,000 |  |  |  |  |  |  |
Pre-tax gain (loss) on sale |  | $ 0 |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | CUSIP Global Services |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Divestiture consideration |  |  |  |  |  |  |  |  | $ 1,925,000,000
Pre-tax gain (loss) on sale |  |  |  |  |  | (2,000,000) |  | 1,341,000,000 |
Gain (loss) on disposition after tax |  |  |  |  |  | $ (2,000,000) |  | $ 1,005,000,000.000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | OPIS |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Divestiture consideration |  |  | $ 1,150,000,000 |  |  |  |  |  |
Pre-tax gain (loss) on sale |  |  | 0 |  |  |  |  |  |
IHS Markit |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Fair value of S&P Global common stock and replacement equity awards |  |  | $ 43,500,000,000 |  |  |  |  |  |

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