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Equity - Accelerated Share Repurchase Program (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 2 Months Ended | 3 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 02, 2019 | Oct. 31, 2017 | Jul. 31, 2019 | Sep. 25, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total cash utilized |  |  |  |  | $ 1,240 | $ 1,660 | $ 1,001
Accelerated Share Repurchases, August 2019 |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Average price paid per share (USD per share) |  |  |  |  | $ 253.36 |  |
Total cash utilized |  |  |  |  | $ 500 |  |
Accelerated Share Repurchases, August 2019 | Initial Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  | 1.8 |  |
Accelerated Share Repurchases, August 2019 | Additional Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  | 0.1 |  |
Accelerated Share Repurchases, August 2019 | Completed Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  | 2.0 |  |
Accelerated Share Repurchases, February 2019 |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Average price paid per share (USD per share) |  |  |  |  | $ 214.65 |  |
Total cash utilized |  |  |  |  | $ 500 |  |
Authorized amount repurchased (as a percent) |  |  | 85.00% |  |  |  |
Accelerated Share Repurchases, February 2019 | Initial Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  | 2.2 |  |
Accelerated Share Repurchases, February 2019 | Additional Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  | 0.1 |  |
Accelerated Share Repurchases, February 2019 | Completed Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  | 2.3 |  |
Accelerated Share Repurchases, October 2018 |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Average price paid per share (USD per share) |  |  |  |  |  | $ 173.80 |
Total cash utilized |  |  |  |  |  | $ 500 |
Authorized amount repurchased (as a percent) | 85.00% |  |  |  |  |  |
Accelerated Share Repurchases, October 2018 | Initial Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  |  | 2.5 |
Accelerated Share Repurchases, October 2018 | Additional Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  |  | 0.4 |
Accelerated Share Repurchases, October 2018 | Completed Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  |  | 2.9 |
Accelerated Share Repurchases, March 2018 |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Average price paid per share (USD per share) |  |  |  |  |  | $ 197.49 |
Total cash utilized |  |  |  |  |  | $ 1,000 |
Authorized amount repurchased (as a percent) |  |  |  | 85.00% |  |  |
Accelerated Share Repurchases, March 2018 | Initial Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  |  | 4.5 |
Accelerated Share Repurchases, March 2018 | Additional Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  |  | 0.6 |
Accelerated Share Repurchases, March 2018 | Completed Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  |  | 5.1 |
Accelerated Share Repurchases, August 2017 |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Average price paid per share (USD per share) |  |  |  |  |  |  | $ 154.46
Total cash utilized |  |  |  |  |  |  | $ 500
Authorized amount repurchased (as a percent) |  | 85.00% |  |  |  |  |
Accelerated Share Repurchases, August 2017 | Initial Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  |  |  | 2.8
Accelerated Share Repurchases, August 2017 | Additional Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  |  |  | 0.5
Accelerated Share Repurchases, August 2017 | Completed Award |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |
Total number of shares purchased (shares) |  |  |  |  |  |  | 3.2

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