Acquisitions, Dispositions, Goodwill and Other Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] | ||||
| Amortization of Intangible Assets | $ 211 | $ 197 | $ 626 | $ 578 |
| Amortization Expense, Remaining 2017 | 210 | 210 | ||
| Amortization Expense, 2018 | 879 | 879 | ||
| Amortization Expense, 2019 | 866 | 866 | ||
| Amortization Expense, 2020 | 888 | 888 | ||
| Amortization Expense, 2021 | 898 | 898 | ||
| Amortization Expense, 2022 | $ 893 | $ 893 | ||