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Stockholders' Equity - Narrative (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 $ / shares | Mar. 31, 2018 USD ($) shares | Sep. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2018 EUR (€) vote | Sep. 30, 2018 GBP (£) vote | Sep. 30, 2018 USD ($) vote | May 31, 2018 USD ($) | Sep. 30, 2017 EUR (€)
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 | $ 0.39 |  | $ 0.39 | $ 0.34 | $ 0.34 | $ 0.73 | $ 0.62 |  |  |  |  |
Authorized repurchase amount (up to) |  |  |  |  |  |  |  |  |  |  | $ 4,000,000,000.0 |
Common stock repurchased (shares) | shares |  |  | 4.6 | 2.0 |  |  |  |  |  |  |  |
Shares repurchased during period |  |  | $ 580,000,000 | $ 297,000,000 |  |  |  |  |  |  |  |
Average price per share of shares repurchased (in usd per share) | $ / shares |  |  | $ 127.39 | $ 147.92 |  |  |  |  |  |  |  |
Authorized amount available for future repurchases |  |  |  |  |  |  |  |  |  | $ 4,200,000,000 |  |
Translation gain (loss) attributable to redeemable noncontrolling interest |  |  | $ 23,000,000 |  | $ 63,000,000 | $ 184,000,000 | $ 177,000,000 |  |  |  |  |
Long-term debt outstanding |  | $ 7,880,000,000 |  |  |  |  |  |  |  | $ 7,694,000,000 |  |
Net actuarial (gains) losses attributable to redeemable noncontrolling interest |  |  | 0 |  | 0 | 2,000,000 | (1,000,000) |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Translation gain (loss) attributable to redeemable noncontrolling interest |  |  |  |  | (63,000,000) |  | (177,000,000) |  |  |  |  |
Derivatives used in net investment hedge, gains (loss) gross |  |  | 5,000,000 |  |  | 39,000,000 |  |  |  |  |  |
Term Loan | Euro Denominated Notes |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt outstanding | € |  |  |  |  |  |  |  | € 1,950,000,000.00 |  |  |  | € 1,200,000,000.00
Term Loan | British Pound Sterling Denominated Notes |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt outstanding | £ |  |  |  |  |  |  |  |  | £ 450,000,000 |  |  |
Accelerated Share Repurchase |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Authorized repurchase amount (up to) |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
Common stock repurchased (shares) | shares |  | 2.5 |  | 1.0 |  |  |  |  |  |  |  |
Average price per share of shares repurchased (in usd per share) | $ / shares |  |  |  | $ 143.66 |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Translation gain (loss) attributable to redeemable noncontrolling interest |  |  | $ 7,000,000 |  | $ 33,000,000 | $ 46,000,000 | $ 148,000,000 |  |  |  |  |

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