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Equity and Noncontrolling Interests Equity and Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |
Deferred tax asset from stock options exercised and restricted stock vestings |  | $ 179 |
Stock repurchase program, authorized amount | $ 1,000 | 1,000 |
Treasury Stock, Value, Acquired, Cost Method | 467 | 150 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 1,600 |  |
Post Merger Stock Repurchase Program [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock repurchase program, authorized amount |  |  | $ 1,000
Parent |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury Stock, Value, Acquired, Cost Method | 467 | 150 |
Accounting Standards Update 2014-09 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | (45) |  |
Accounting Standards Update 2014-09 [Member] | Parent |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | (45) | 0 |
Accounting Standards Update 2016-16 [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | (546) |  |
Accounting Standards Update 2016-16 [Member] | Parent |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Cumulative Effect on Retained Earnings, Net of Tax | $ (546) | $ 0 |

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