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Quarterly Operating Results (unaudited) (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reserve for revenues and accounts receivables |  |  |  |  | $ 35 |  |  |  |  |  |
Amortization of intangible assets | $ 27 | $ 25 | $ 30 | $ 29 | 28 | $ 27 | $ 26 | $ 26 | $ 96 | $ 90 | $ 74
Restructuring and integration charges | 14 | 16 | 26 | 22 | 47 | 19 | 25 | 31 |  |  |
Gain associated with an insurance claim for hurricane |  |  |  | 8 |  |  |  |  |  |  |
Share-based compensation, excess tax benefit, amount | 2 | 3 | 5 | 3 | 1 | 4 | 5 | 8 | 13 | 18 | 37
Cost incurred do to incident |  | 3 |  |  |  |  |  |  |  |  |
Gain from sale and leaseback of property | 72 |  |  |  |  |  |  |  |  |  |
Legal costs and gain associated with insurance claim |  |  |  |  |  |  | 10 |  |  |  |
Income tax benefit associated with changes in tax return accounting method |  |  |  |  |  |  | 15 |  |  | 15 |
Decrease in contingent consideration and noncash impairment |  |  |  |  |  | 12 |  |  |  |  |
Loss (gain) on disposition of business |  |  |  |  | (4) |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) |  |  |  |  | 1 |  |  |  |  |  |
Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost incurred do to incident |  | (4) |  |  |  |  |  |  |  |  |
Gain from sale and leaseback of property | (1) |  |  |  |  |  |  |  |  |  |
Other Operating Income (Expense) |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contingent consideration arrangements |  |  | 6 |  |  |  |  |  |  |  |
Cost incurred do to incident |  | 7 |  |  |  |  |  |  |  |  |
Gain from sale and leaseback of property | 73 |  |  |  |  |  |  |  | 73 |  |
NID |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on settling uncertain tax benefits |  |  | 20 |  |  |  |  |  | 20 |  |
Intangible Assets |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets | 24 | 23 | 25 | 24 | 24 | 22 | 22 | 22 | $ 96 | $ 90 | $ 74
Equity in Earnings of Equity Method Investees |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of intangible assets | 3 | 2 | 5 | 5 | 4 | 5 | 4 | 4 |  |  |
Cost of Sales |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and integration charges | 6 | 7 | 11 | 11 | 20 | 10 | 14 | 12 |  |  |
Legal costs and gain associated with insurance claim |  |  |  |  |  |  | 11 |  |  |  |
Decrease in contingent consideration and noncash impairment |  |  |  |  |  | (1) |  |  |  |  |
Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and integration charges | $ 8 | $ 9 | $ 15 | 11 | $ 27 | 9 | 11 | 18 |  |  |
Gain associated with an insurance claim for hurricane |  |  |  | 1 |  |  |  |  |  |  |
Other Operating Income (Expense) |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and integration charges |  |  |  |  |  |  |  | $ 1 |  |  |
Gain associated with an insurance claim for hurricane |  |  |  | $ 9 |  |  |  |  |  |  |
Legal costs and gain associated with insurance claim |  |  |  |  |  |  | $ (1) |  |  |  |
Decrease in contingent consideration and noncash impairment |  |  |  |  |  | $ 13 |  |  |  |  |

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