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Stockholders' Equity - Narrative (Details) $ / shares in Units, £ in Millions, shares in Millions, $ in Millions, € in Billions |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Jul. 26, 2017 $ / shares | Jun. 30, 2017 USD ($) | Apr. 30, 2017 shares | Mar. 31, 2017 USD ($) shares | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares | Jun. 30, 2017 EUR (€) vote | Jun. 30, 2017 GBP (£) vote | Jun. 30, 2017 USD ($) vote
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Share of common stock outstanding, vote on proposals | vote |  |  |  |  |  |  | 1 | 1 | 1
Dividends declared per common share (in dollars per share) | $ / shares |  |  |  |  | $ 0.28 | $ 0.28 |  |  |
Authorized amount available for future repurchases |  |  |  |  |  |  |  |  | $ 2,500
Translation gain (loss) attributable to redeemable noncontrolling interest |  |  |  |  | $ 115 | $ (67) |  |  |
Reclassified to income statement, net of income tax expense of nil and nil |  |  |  |  | 20 |  |  |  |
Long-term debt outstanding |  |  |  | $ 8,362 |  |  |  |  | $ 7,949
Net actuarial losses attributable to redeemable noncontrolling interest |  |  |  |  | 1 | $ 1 |  |  |
Term Loan | Euro Denominated Notes |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt outstanding | € |  |  |  |  |  |  | € 1.2 |  |
Term Loan | British Pound Sterling Denominated Notes |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt outstanding | £ |  |  |  |  |  |  |  | £ 450 |
Net Investment Hedging |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Losses from net investment hedges recorded in other comprehensive income |  |  |  |  | $ 114 |  |  |  |
Accelerated Share Repurchase |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchased |  | $ 250 |  | $ 250 |  |  |  |  |
Common stock repurchased (shares) | shares |  |  | 0.3 | 1.4 | 1.2 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ / shares | $ 0.34 |  |  |  |  |  |  |  |

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