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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 09, 2020 shares | Jul. 31, 2020 $ / shares | Jun. 30, 2020 $ / shares | Mar. 31, 2021 USD ($) vote $ / shares | Mar. 31, 2020 USD ($) $ / shares | Mar. 31, 2019 USD ($) $ / shares shares | Jan. 31, 2021 USD ($) | Mar. 10, 2020 $ / shares shares | May 31, 2018 USD ($) | Mar. 31, 2018 USD ($)
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Number of votes | vote |  |  |  | 1 |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares |  | $ 0.42 | $ 0.41 | $ 1.67 | $ 1.62 | $ 1.51 |  |  |  |
Total authorization outstanding for repurchases of common stock |  |  |  | $ 2,785 | $ 1,535 | $ 3,469 |  |  |  | $ 1,096
Additional authorized |  |  |  |  |  |  | $ 2,000 |  | $ 4,000 |
Treasury stock retired (in shares) | shares |  |  |  |  |  | 5,000,000.0 |  |  |  |
Retirement of common stock |  |  |  |  |  | $ 542 |  |  |  |
Shares distributed to stockholders (shares) | shares | 176,000,000.0 |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  | $ 99 | $ 53 |  |  |  |  |
Net foreign currency translation gains (losses) |  |  |  | 170 | 149 | (198) |  |  |  |
Gains (losses) from net investment hedges |  |  |  | (118) | 39 | 259 |  |  |  |
Change Healthcare |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares | 15,400,000 |  |  |  |  |  |  |  |  |
Other accrued liabilities |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Accrued shares repurchased |  |  |  | 8 |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Retirement of common stock |  |  |  |  |  | 472 |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Retirement of common stock |  |  |  |  |  | 70 |  |  |  |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  | 312 | (151) | (431) |  |  |  |
Net foreign currency translation gains (losses) |  |  |  | 359 | (151) | (431) |  |  |  |
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Net foreign currency translation gains (losses) |  |  |  | (60) | 1 | (61) |  |  |  |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications |  |  |  | 8 | 2 | (5) |  |  |  |
Net Investment Hedging |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Gains (losses) recorded in other comprehensive income |  |  |  | $ (119) | $ 76 | $ 53 |  |  |  |
Separation of Change Healthcare JV |  |  |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |  |  |
Shares distributed to stockholders (shares) | shares | 176,000,000.0 |  |  |  |  |  |  |  |  |
Shares of common stock exchanged (shares) | shares | 15,400,000 |  |  |  |  |  |  |  |  |
Number of shares converted into per share converted (shares) | shares |  |  |  |  |  |  |  | 1 |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.001 |  |

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