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Guarantee of Registered Securities - Condensed Consolidating Statement of Financial Position (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
CURRENT ASSETS : |  |  |  |
Cash and cash equivalents | $ 367 | $ 374 | $ 418 | $ 477
Short-term investments | 484 | 394 |  |
Receivables, net | 2,684 | 2,815 |  |
Fiduciary assets | 11,389 | 11,638 |  |
Intercompany receivables | 0 | 0 |  |
Other current assets | 731 | 602 |  |
Total Current Assets | 15,655 | 15,823 |  |
Goodwill | 8,661 | 8,860 |  |
Intangible assets, net | 2,350 | 2,520 |  |
Fixed assets, net | 782 | 765 |  |
Intercompany receivables | 0 | 0 |  |
Other non-current assets | 1,755 | 1,804 |  |
Investment in subsidiary | 0 | 0 |  |
TOTAL ASSETS | 29,203 | 29,772 |  |
CURRENT LIABILITIES |  |  |  |
Fiduciary liabilities | 11,389 | 11,638 |  |
Short-term debt and current portion of long-term debt | 1,237 | 783 |  |
Accounts payable and accrued liabilities | 1,368 | 1,805 |  |
Intercompany payables | 0 | 0 |  |
Other current liabilities | 845 | 788 |  |
Total Current Liabilities | 14,839 | 15,014 |  |
Long-term debt | 4,824 | 4,799 |  |
Pension, other post-retirement and post-employment liabilities | 1,944 | 2,141 |  |
Intercompany payables | 0 | 0 |  |
Other non-current liabilities | 1,140 | 1,187 |  |
TOTAL LIABILITIES | 22,747 | 23,141 |  |
TOTAL AON SHAREHOLDERS' EQUITY | 6,398 | 6,571 |  |
Noncontrolling interests | 58 | 60 |  |
TOTAL EQUITY | 6,456 | 6,631 |  |
TOTAL LIABILITIES AND EQUITY | 29,203 | 29,772 |  |
Aon plc [Member] |  |  |  |
CURRENT ASSETS : |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Short-term investments | 0 | 0 |  |
Receivables, net | 0 | 0 |  |
Fiduciary assets | 0 | 0 |  |
Intercompany receivables | 258 | 455 |  |
Other current assets | 2 | 2 |  |
Total Current Assets | 260 | 457 |  |
Goodwill | 0 | 0 |  |
Intangible assets, net | 0 | 0 |  |
Fixed assets, net | 0 | 0 |  |
Intercompany receivables | 7,379 | 7,399 |  |
Other non-current assets | 189 | 179 |  |
Investment in subsidiary | 4,488 | 4,962 |  |
TOTAL ASSETS | 12,316 | 12,997 |  |
CURRENT LIABILITIES |  |  |  |
Fiduciary liabilities | 0 | 0 |  |
Short-term debt and current portion of long-term debt | 0 | 0 |  |
Accounts payable and accrued liabilities | 2,597 | 3,755 |  |
Intercompany payables | 223 | 122 |  |
Other current liabilities | 0 | 0 |  |
Total Current Liabilities | 2,820 | 3,877 |  |
Long-term debt | 3,092 | 2,544 |  |
Pension, other post-retirement and post-employment liabilities | 0 | 0 |  |
Intercompany payables | 0 | 0 |  |
Other non-current liabilities | 6 | 5 |  |
TOTAL LIABILITIES | 5,918 | 6,426 |  |
TOTAL AON SHAREHOLDERS' EQUITY | 6,398 | 6,571 |  |
Noncontrolling interests | 0 | 0 |  |
TOTAL EQUITY | 6,398 | 6,571 |  |
TOTAL LIABILITIES AND EQUITY | 12,316 | 12,997 |  |
Aon Corporation [Member] |  |  |  |
CURRENT ASSETS : |  |  |  |
Cash and cash equivalents | 2,221 | 2,727 | 181 | 247
Short-term investments | 125 | 165 |  |
Receivables, net | 0 | 0 |  |
Fiduciary assets | 0 | 0 |  |
Intercompany receivables | 3,847 | 2,814 |  |
Other current assets | 223 | 226 |  |
Total Current Assets | 6,416 | 5,932 |  |
Goodwill | 0 | 0 |  |
Intangible assets, net | 0 | 0 |  |
Fixed assets, net | 0 | 0 |  |
Intercompany receivables | 581 | 600 |  |
Other non-current assets | 693 | 697 |  |
Investment in subsidiary | 15,799 | 15,200 |  |
TOTAL ASSETS | 23,489 | 22,429 |  |
CURRENT LIABILITIES |  |  |  |
Fiduciary liabilities | 0 | 0 |  |
Short-term debt and current portion of long-term debt | 1,225 | 767 |  |
Accounts payable and accrued liabilities | 49 | 58 |  |
Intercompany payables | 9,975 | 8,960 |  |
Other current liabilities | 55 | 49 |  |
Total Current Liabilities | 11,304 | 9,834 |  |
Long-term debt | 1,418 | 1,917 |  |
Pension, other post-retirement and post-employment liabilities | 1,336 | 1,396 |  |
Intercompany payables | 8,787 | 7,277 |  |
Other non-current liabilities | 102 | 125 |  |
TOTAL LIABILITIES | 22,947 | 20,549 |  |
TOTAL AON SHAREHOLDERS' EQUITY | 542 | 1,880 |  |
Noncontrolling interests | 0 | 0 |  |
TOTAL EQUITY | 542 | 1,880 |  |
TOTAL LIABILITIES AND EQUITY | 23,489 | 22,429 |  |
Other Non-Guarantor Subsidiaries [Member] |  |  |  |
CURRENT ASSETS : |  |  |  |
Cash and cash equivalents | 707 | 1,361 | 1,416 | 1,246
Short-term investments | 359 | 229 |  |
Receivables, net | 2,684 | 2,815 |  |
Fiduciary assets | 11,389 | 11,638 |  |
Intercompany receivables | 10,286 | 9,156 |  |
Other current assets | 538 | 407 |  |
Total Current Assets | 25,963 | 25,606 |  |
Goodwill | 8,661 | 8,860 |  |
Intangible assets, net | 2,350 | 2,520 |  |
Fixed assets, net | 782 | 765 |  |
Intercompany receivables | 1,621 | 111 |  |
Other non-current assets | 1,656 | 1,718 |  |
Investment in subsidiary | 542 | 1,880 |  |
TOTAL ASSETS | 41,575 | 41,460 |  |
CURRENT LIABILITIES |  |  |  |
Fiduciary liabilities | 11,389 | 11,638 |  |
Short-term debt and current portion of long-term debt | 12 | 16 |  |
Accounts payable and accrued liabilities | 1,283 | 1,706 |  |
Intercompany payables | 4,194 | 3,343 |  |
Other current liabilities | 822 | 772 |  |
Total Current Liabilities | 17,700 | 17,475 |  |
Long-term debt | 314 | 338 |  |
Pension, other post-retirement and post-employment liabilities | 608 | 745 |  |
Intercompany payables | 794 | 833 |  |
Other non-current liabilities | 1,814 | 1,847 |  |
TOTAL LIABILITIES | 21,230 | 21,238 |  |
TOTAL AON SHAREHOLDERS' EQUITY | 20,287 | 20,162 |  |
Noncontrolling interests | 58 | 60 |  |
TOTAL EQUITY | 20,345 | 20,222 |  |
TOTAL LIABILITIES AND EQUITY | 41,575 | 41,460 |  |
Consolidating Adjustments [Member] |  |  |  |
CURRENT ASSETS : |  |  |  |
Cash and cash equivalents | (2,561) | (3,714) | $ (1,179) | $ (1,016)
Short-term investments | 0 | 0 |  |
Receivables, net | 0 | 0 |  |
Fiduciary assets | 0 | 0 |  |
Intercompany receivables | (14,391) | (12,425) |  |
Other current assets | (32) | (33) |  |
Total Current Assets | (16,984) | (16,172) |  |
Goodwill | 0 | 0 |  |
Intangible assets, net | 0 | 0 |  |
Fixed assets, net | 0 | 0 |  |
Intercompany receivables | (9,581) | (8,110) |  |
Other non-current assets | (783) | (790) |  |
Investment in subsidiary | (20,829) | (22,042) |  |
TOTAL ASSETS | (48,177) | (47,114) |  |
CURRENT LIABILITIES |  |  |  |
Fiduciary liabilities | 0 | 0 |  |
Short-term debt and current portion of long-term debt | 0 | 0 |  |
Accounts payable and accrued liabilities | (2,561) | (3,714) |  |
Intercompany payables | (14,392) | (12,425) |  |
Other current liabilities | (32) | (33) |  |
Total Current Liabilities | (16,985) | (16,172) |  |
Long-term debt | 0 | 0 |  |
Pension, other post-retirement and post-employment liabilities | 0 | 0 |  |
Intercompany payables | (9,581) | (8,110) |  |
Other non-current liabilities | (782) | (790) |  |
TOTAL LIABILITIES | (27,348) | (25,072) |  |
TOTAL AON SHAREHOLDERS' EQUITY | (20,829) | (22,042) |  |
Noncontrolling interests | 0 | 0 |  |
TOTAL EQUITY | (20,829) | (22,042) |  |
TOTAL LIABILITIES AND EQUITY | $ (48,177) | $ (47,114) |  |

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