Acquisitions, Goodwill and Intangible Assets (Expected annual amortization expense for intangible assets) (Details) $ in Millions |
Mar. 31, 2017
USD ($)
|
|---|---|
| Anticipated Future Amortization Expense [Abstract] | |
| 2017 | $ 53 |
| 2018 | 58 |
| 2019 | 63 |
| 2020 | 63 |
| 2021 | 62 |
| Thereafter | 344 |
| Up-front sales incentives [Member] | |
| Anticipated Future Amortization Expense [Abstract] | |
| 2017 | 13 |
| 2018 | 20 |
| 2019 | 26 |
| 2020 | 28 |
| 2021 | 28 |
| Thereafter | 140 |
| Intangible Assets Excluding Up Front Sales Incentives [Member] | |
| Anticipated Future Amortization Expense [Abstract] | |
| 2017 | 40 |
| 2018 | 38 |
| 2019 | 37 |
| 2020 | 35 |
| 2021 | 34 |
| Thereafter | $ 204 |