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Acquisitions and Dispositions of Businesses - Acquisitions (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) acquisition | Dec. 31, 2016 USD ($) acquisition
Business Acquisition |  |
Number of business acquired under business combination | acquisition | 4 | 8
Assets acquired: |  |
Goodwill | $ 7,745 | $ 7,410
2017 Acquisitions |  |
Business Combination, Consideration Transferred [Abstract] |  |
Cash | 148 |
Deferred and contingent consideration | 28 |
Aggregate consideration transferred | 176 |
Assets acquired: |  |
Cash and cash equivalents | 5 |
Receivables, net | 11 |
Goodwill | 119 |
Intangible assets, net | 69 |
Fixed assets, net | 1 |
Other assets | 8 |
Total assets acquired | 213 |
Liabilities assumed: |  |
Current liabilities | 15 |
Other liabilities | 22 |
Total liabilities assumed | 37 |
Net assets acquired | $ 176 |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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