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Guarantee of Registered Securities - Condensed Consolidating Statement of Financial Position (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Total current assets |  |  |  |  |
Cash and cash equivalents | $ 656 |  | $ 756 |  |
Short-term investments | 172 |  | 529 |  |
Receivables, net | 2,760 | $ 2,730 | 2,478 |  |
Fiduciary assets | 10,166 |  | 9,625 |  |
Intercompany receivables | 0 |  | 0 |  |
Other current assets | 618 | 587 | 289 |  |
Total current assets | 14,372 |  | 13,677 |  |
Goodwill | 8,171 |  | 8,358 | $ 7,410 |
Intangible assets, net | 1,149 |  | 1,733 |  |
Fixed assets, net | 588 |  | 564 |  |
Deferred tax assets | 561 | 261 | 389 |  |
Deferred tax assets | 0 |  | 0 |  |
Prepaid pension | 1,133 |  | 1,060 |  |
Other non-current assets | 448 | 452 | 307 |  |
Investment in subsidiary | 0 |  | 0 |  |
Total assets | 26,422 |  | 26,088 |  |
Current liabilities |  |  |  |  |
Accounts payable and accrued liabilities | 1,943 |  | 1,961 |  |
Short-term debt and current portion of long-term debt | 251 |  | 299 |  |
Fiduciary liabilities | 10,166 | 1,969 | 9,625 |  |
Intercompany payables | 0 |  | 0 |  |
Other current liabilities | 936 | 883 | 870 |  |
Total current liabilities | 13,296 |  | 12,755 |  |
Long-term debt | 5,993 |  | 5,667 |  |
Deferred tax liabilities | 181 | 169 | 127 |  |
Pension, other postretirement and other post-employment liabilities | 1,636 |  | 1,789 |  |
Intercompany payables | 0 |  | 0 |  |
Other non-current liabilities | 1,097 | 1,099 | 1,102 |  |
Total liabilities | 22,203 |  | 21,440 |  |
Total Aon shareholders' equity | 4,151 |  | 4,583 |  |
Noncontrolling interests | 68 |  | 65 |  |
Total equity | 4,219 | $ 5,155 | 4,648 | $ 5,532 | $ 6,059
Total liabilities and equity | 26,422 |  | 26,088 |  |
Aon plc |  |  |  |  |
Total current assets |  |  |  |  |
Cash and cash equivalents | 0 |  | 1 |  |
Short-term investments | 0 |  | 0 |  |
Receivables, net | 0 |  | 0 |  |
Fiduciary assets | 0 |  | 0 |  |
Intercompany receivables | 191 |  | 165 |  |
Other current assets | 0 |  | 1 |  |
Total current assets | 191 |  | 167 |  |
Goodwill | 0 |  | 0 |  |
Intangible assets, net | 0 |  | 0 |  |
Fixed assets, net | 0 |  | 0 |  |
Deferred tax assets | 94 |  | 99 |  |
Deferred tax assets | 403 |  | 414 |  |
Prepaid pension | 0 |  | 0 |  |
Other non-current assets | 1 |  | 1 |  |
Investment in subsidiary | 8,433 |  | 8,884 |  |
Total assets | 9,122 |  | 9,565 |  |
Current liabilities |  |  |  |  |
Accounts payable and accrued liabilities | 274 |  | 574 |  |
Short-term debt and current portion of long-term debt | 250 |  | 0 |  |
Fiduciary liabilities | 0 |  | 0 |  |
Intercompany payables | 213 |  | 130 |  |
Other current liabilities | 0 |  | 16 |  |
Total current liabilities | 737 |  | 720 |  |
Long-term debt | 4,231 |  | 4,251 |  |
Deferred tax liabilities | 0 |  | 0 |  |
Pension, other postretirement and other post-employment liabilities | 0 |  | 0 |  |
Intercompany payables | 0 |  | 0 |  |
Other non-current liabilities | 3 |  | 11 |  |
Total liabilities | 4,971 |  | 4,982 |  |
Total Aon shareholders' equity | 4,151 |  | 4,583 |  |
Noncontrolling interests | 0 |  | 0 |  |
Total equity | 4,151 |  | 4,583 |  |
Total liabilities and equity | 9,122 |  | 9,565 |  |
Aon Corporation |  |  |  |  |
Total current assets |  |  |  |  |
Cash and cash equivalents | 862 |  | 2,524 |  |
Short-term investments | 56 |  | 355 |  |
Receivables, net | 0 |  | 2 |  |
Fiduciary assets | 0 |  | 0 |  |
Intercompany receivables | 897 |  | 1,046 |  |
Other current assets | 16 |  | 29 |  |
Total current assets | 1,831 |  | 3,956 |  |
Goodwill | 0 |  | 0 |  |
Intangible assets, net | 0 |  | 0 |  |
Fixed assets, net | 0 |  | 0 |  |
Deferred tax assets | 467 |  | 396 |  |
Deferred tax assets | 261 |  | 261 |  |
Prepaid pension | 5 |  | 6 |  |
Other non-current assets | 30 |  | 35 |  |
Investment in subsidiary | 19,065 |  | 17,799 |  |
Total assets | 21,659 |  | 22,453 |  |
Current liabilities |  |  |  |  |
Accounts payable and accrued liabilities | 70 |  | 36 |  |
Short-term debt and current portion of long-term debt | 0 |  | 0 |  |
Fiduciary liabilities | 0 |  | 0 |  |
Intercompany payables | 11,695 |  | 11,149 |  |
Other current liabilities | 69 |  | 64 |  |
Total current liabilities | 11,834 |  | 11,249 |  |
Long-term debt | 1,762 |  | 1,415 |  |
Deferred tax liabilities | 0 |  | 0 |  |
Pension, other postretirement and other post-employment liabilities | 1,275 |  | 1,391 |  |
Intercompany payables | 7,570 |  | 8,398 |  |
Other non-current liabilities | 115 |  | 91 |  |
Total liabilities | 22,556 |  | 22,544 |  |
Total Aon shareholders' equity | (897) |  | (91) |  |
Noncontrolling interests | 0 |  | 0 |  |
Total equity | (897) |  | (91) |  |
Total liabilities and equity | 21,659 |  | 22,453 |  |
Other Non-Guarantor Subsidiaries |  |  |  |  |
Total current assets |  |  |  |  |
Cash and cash equivalents | 575 |  | 793 |  |
Short-term investments | 116 |  | 174 |  |
Receivables, net | 2,760 |  | 2,476 |  |
Fiduciary assets | 10,166 |  | 9,625 |  |
Intercompany receivables | 11,454 |  | 10,824 |  |
Other current assets | 602 |  | 259 |  |
Total current assets | 25,673 |  | 24,151 |  |
Goodwill | 8,171 |  | 8,358 |  |
Intangible assets, net | 1,149 |  | 1,733 |  |
Fixed assets, net | 588 |  | 564 |  |
Deferred tax assets | 144 |  | 143 |  |
Deferred tax assets | 7,405 |  | 8,232 |  |
Prepaid pension | 1,128 |  | 1,054 |  |
Other non-current assets | 417 |  | 271 |  |
Investment in subsidiary | (897) |  | (91) |  |
Total assets | 43,778 |  | 44,415 |  |
Current liabilities |  |  |  |  |
Accounts payable and accrued liabilities | 2,380 |  | 3,913 |  |
Short-term debt and current portion of long-term debt | 1 |  | 299 |  |
Fiduciary liabilities | 10,166 |  | 9,625 |  |
Intercompany payables | 634 |  | 756 |  |
Other current liabilities | 867 |  | 790 |  |
Total current liabilities | 14,048 |  | 15,383 |  |
Long-term debt | 0 |  | 1 |  |
Deferred tax liabilities | 325 |  | 376 |  |
Pension, other postretirement and other post-employment liabilities | 361 |  | 398 |  |
Intercompany payables | 499 |  | 509 |  |
Other non-current liabilities | 979 |  | 1,000 |  |
Total liabilities | 16,212 |  | 17,667 |  |
Total Aon shareholders' equity | 27,498 |  | 26,683 |  |
Noncontrolling interests | 68 |  | 65 |  |
Total equity | 27,566 |  | 26,748 |  |
Total liabilities and equity | 43,778 |  | 44,415 |  |
Consolidating Adjustments |  |  |  |  |
Total current assets |  |  |  |  |
Cash and cash equivalents | (781) |  | (2,562) |  |
Short-term investments | 0 |  | 0 |  |
Receivables, net | 0 |  | 0 |  |
Fiduciary assets | 0 |  | 0 |  |
Intercompany receivables | (12,542) |  | (12,035) |  |
Other current assets | 0 |  | 0 |  |
Total current assets | (13,323) |  | (14,597) |  |
Goodwill | 0 |  | 0 |  |
Intangible assets, net | 0 |  | 0 |  |
Fixed assets, net | 0 |  | 0 |  |
Deferred tax assets | (144) |  | (249) |  |
Deferred tax assets | (8,069) |  | (8,907) |  |
Prepaid pension | 0 |  | 0 |  |
Other non-current assets | 0 |  | 0 |  |
Investment in subsidiary | (26,601) |  | (26,592) |  |
Total assets | (48,137) |  | (50,345) |  |
Current liabilities |  |  |  |  |
Accounts payable and accrued liabilities | (781) |  | (2,562) |  |
Short-term debt and current portion of long-term debt | 0 |  | 0 |  |
Fiduciary liabilities | 0 |  | 0 |  |
Intercompany payables | (12,542) |  | (12,035) |  |
Other current liabilities | 0 |  | 0 |  |
Total current liabilities | (13,323) |  | (14,597) |  |
Long-term debt | 0 |  | 0 |  |
Deferred tax liabilities | (144) |  | (249) |  |
Pension, other postretirement and other post-employment liabilities | 0 |  | 0 |  |
Intercompany payables | (8,069) |  | (8,907) |  |
Other non-current liabilities | 0 |  | 0 |  |
Total liabilities | (21,536) |  | (23,753) |  |
Total Aon shareholders' equity | (26,601) |  | (26,592) |  |
Noncontrolling interests | 0 |  | 0 |  |
Total equity | (26,601) |  | (26,592) |  |
Total liabilities and equity | $ (48,137) |  | $ (50,345) |  |

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