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Quarterly Operating Results (unaudited) (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reserve for revenues and accounts receivables | $ 35 |  |  |  |  |  |  |  |  |  |
Restructuring and integration charges | 47 | $ 19 | $ 25 | $ 31 | $ 42 | $ 23 | $ 23 | $ 18 |  |  |
Share-based compensation, excess tax benefit, amount | 1 | 4 | 5 | 8 | 1 | 7 | 13 | 16 | $ 18 | $ 37 | $ 9
Income tax benefit associated with changes in tax return accounting method |  |  | 15 |  |  |  |  |  | 15 |  |
Legal costs and gain associated with insurance claim |  |  | 10 |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) | 1 |  |  |  |  |  |  |  |  |  |
Decrease in contingent consideration and noncash impairment |  | 12 |  |  |  |  |  |  |  |  |
Loss (gain) on disposition of business |  |  |  |  |  |  |  |  | (4) | 0 | $ 118
Domestic Country [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) |  |  |  |  | (106) |  |  |  |  | (106) |
Tax Cuts and Jobs Act of 2017, deferred tax expense (benefit) |  |  |  |  | (115) |  |  |  |  | (115) |
Tax Cuts and Jobs Act of 2017, current income tax expense (benefit) |  |  |  |  | 9 |  |  |  | $ 1 | $ 9 |
Income (Loss) from Equity Method Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and integration charges |  |  |  |  |  |  | 1 |  |  |  |
Other Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain related to sale |  |  |  |  |  |  | 7 |  |  |  |
Discontinued Operations, Disposed of by Sale [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss (gain) on disposition of business | (4) |  |  |  |  |  |  |  |  |  |
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges and costs incurred as a result of hurricanes |  |  |  |  | 6 | 9 |  |  |  |  |
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member] | Other Nonoperating Income (Expense) [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges and costs incurred as a result of hurricanes |  |  |  |  |  | 5 |  |  |  |  |
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member] | Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges and costs incurred as a result of hurricanes |  |  |  |  | 2 | 3 |  |  |  |  |
Non-cash asset impairment charges and costs incurred as a result of hurricanes [Member] | Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges and costs incurred as a result of hurricanes |  |  |  |  | 4 | 1 |  |  |  |  |
Cost of Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and integration charges | 20 | 10 | 14 | 12 | 14 | 12 | 9 | 10 |  |  |
Legal costs and gain associated with insurance claim |  |  | 11 |  |  |  |  |  |  |  |
Decrease in contingent consideration and noncash impairment |  | 1 |  |  |  |  |  |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and integration charges | $ 27 | 9 | 11 | 18 | $ 28 | $ 11 | 13 | $ 8 |  |  |
Selling, General and Administrative Expenses [Member] | Legal Matters [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Legal costs |  |  |  |  |  |  | $ 2 |  |  |  |
Other Operating Income (Expense) [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and integration charges |  |  |  | $ 1 |  |  |  |  |  |  |
Legal costs and gain associated with insurance claim |  |  | $ 1 |  |  |  |  |  |  |  |
Decrease in contingent consideration and noncash impairment |  | $ 13 |  |  |  |  |  |  |  |  |

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