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Shareholders' Equity - Components of Accumulated other comprehensive loss, net of related tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | $ (3,134) | $ (2,374) | $ (2,610)
Other comprehensive loss before reclassifications | (389) | (1,068) | 286
Tax benefit | 23 | 221 | (143)
Other comprehensive loss before reclassifications, net | (366) | (847) | 143
Amounts reclassified from accumulated other comprehensive loss | 128 | 126 | 132
Tax benefit | (51) | (39) | (39)
Amounts reclassified from accumulated other comprehensive loss, net | 77 | 87 | 93
Total other comprehensive (loss) income attributable to Aon shareholders | (289) | (760) | 236
Ending balance | (3,423) | (3,134) | (2,374)
Change in Fair Value of Investments [Member] |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (17) | (21) | (28)
Other comprehensive loss before reclassifications | (4) | (13) | 15
Tax benefit | 1 | 4 | (8)
Other comprehensive loss before reclassifications, net | (3) | (9) | 7
Amounts reclassified from accumulated other comprehensive loss | 11 | 20 | 1
Tax benefit | (16) | (7) | (1)
Amounts reclassified from accumulated other comprehensive loss, net | (5) | 13 | 0
Total other comprehensive (loss) income attributable to Aon shareholders | (8) | 4 | 7
Ending balance | (25) | (17) | (21)
Foreign Currency Translation Adjustments [Member] |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (335) | 169 | 233
Other comprehensive loss before reclassifications | (467) | (492) | (65)
Tax benefit | 31 | (12) | 1
Other comprehensive loss before reclassifications, net | (436) | (504) | (64)
Amounts reclassified from accumulated other comprehensive loss | 0 | 0 | 0
Tax benefit | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss, net | 0 | 0 | 0
Total other comprehensive (loss) income attributable to Aon shareholders | (436) | (504) | (64)
Ending balance | (771) | (335) | 169
Post-retirement Benefit Obligations [Member] |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |
Beginning balance | (2,782) | (2,522) | (2,815)
Other comprehensive loss before reclassifications | 82 | (563) | 336
Tax benefit | (9) | 229 | (136)
Other comprehensive loss before reclassifications, net | 73 | (334) | 200
Amounts reclassified from accumulated other comprehensive loss | 117 | 106 | 131
Tax benefit | (35) | (32) | (38)
Amounts reclassified from accumulated other comprehensive loss, net | 82 | 74 | 93
Total other comprehensive (loss) income attributable to Aon shareholders | 155 | (260) | 293
Ending balance | $ (2,627) | $ (2,782) | $ (2,522)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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