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Acquisitions / Dispositions (Acquired Finite-Lived Intangibles Assets) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired | $ 304 |
Customer Lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired | $ 263 |
Finite-lived intangible assets, remaining amortization period | 12 years |
Other Intangible Assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets acquired | $ 41 | [1]
Finite-lived intangible assets, remaining amortization period | 5 years | [1]
[1] | Primarily non-compete agreements, trade names and developed technology

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