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Stockholders' Equity - Narrative (Details) $ / shares in Units, £ in Millions, shares in Millions, € in Billions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
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Jul. 26, 2017 $ / shares | Aug. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Apr. 30, 2017 shares | Mar. 31, 2017 USD ($) shares | Sep. 30, 2017 USD ($) $ / shares | Jun. 30, 2017 $ / shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares shares | Sep. 30, 2016 USD ($) $ / shares | Sep. 30, 2017 EUR (€) vote | Sep. 30, 2017 GBP (£) vote | Sep. 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 | $ 0.34 |  |  |  |  | $ 0.34 | $ 0.28 | $ 0.28 | $ 0.62 | $ 0.56 |  |  |
Authorized amount available for future repurchases |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,100,000,000
Translation gain (loss) attributable to redeemable noncontrolling interest |  |  |  |  |  | $ 33,000,000 |  | $ 1,000,000 | $ 148,000,000 | $ (66,000,000) |  |  |
Losses reclassified to income statement, net of income tax expense |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |
Losses from net investment hedges recorded in other comprehensive income |  |  |  |  |  | 38,000,000 |  | 0 | 108,000,000 | 0 |  |  |
Long-term debt outstanding |  |  |  |  | $ 8,362,000,000 |  |  |  |  |  |  |  | $ 8,015,000,000
Net actuarial losses attributable to redeemable noncontrolling interest |  |  |  |  |  | 0 |  | $ 0 | 1,000,000 | $ 1,000,000 |  |  |
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 |  |  |  |  |  | $ 63,000,000 |  |  | $ 177,000,000 |  |  |  |
Accelerated Share Repurchase |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |
Common stock repurchased (shares) | shares |  |  |  | 0.3 | 1.4 |  |  |  |  |  |  |  |
June 2017 ASR Program |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |
Common stock repurchased (shares) | shares |  |  |  |  |  |  |  |  | 1.5 |  |  |  |
August 2017 ASR Program |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |
Common stock repurchased (shares) | shares |  |  |  |  |  |  |  |  | 2.1 |  |  |  |

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