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Goodwill and Other Intangible Assets - Schedule of changes in the net carrying amount of goodwill by operating segment (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Changes in the net carrying amount of goodwill by operating segment (in millions) |  |
Balance at the beginning of the period | $ 8,448 | $ 8,860
Goodwill related to current year acquisitions | 642 | 18
Goodwill related to disposals | (34) | (77)
Goodwill related to prior year acquisitions | 4 | 0
Foreign currency translation | (313) | (353)
Balance at the end of the period | 8,747 | 8,448
Risk Solutions |  |
Changes in the net carrying amount of goodwill by operating segment (in millions) |  |
Balance at the beginning of the period | 5,593 | 5,911
Goodwill related to current year acquisitions | 632 | 2
Goodwill related to disposals | (8) | (1)
Goodwill related to prior year acquisitions | 4 | 0
Foreign currency translation | (268) | (319)
Balance at the end of the period | 5,953 | 5,593
HR Solutions |  |
Changes in the net carrying amount of goodwill by operating segment (in millions) |  |
Balance at the beginning of the period | 2,855 | 2,949
Goodwill related to current year acquisitions | 10 | 16
Goodwill related to disposals | (26) | (76)
Goodwill related to prior year acquisitions | 0 | 0
Foreign currency translation | (45) | (34)
Balance at the end of the period | $ 2,794 | $ 2,855

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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