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Guarantee of Registered Securities - Condensed Consolidating Statement of Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Revenue |  |
Total revenue | $ 2,381 | $ 2,276
Expenses |  |
Compensation and benefits | 1,461 | 1,345
Information technology | 88 | 83
Premises | 84 | 82
Depreciation of fixed assets | 54 | 38
Amortization of intangible assets | 43 | 37
Other general expenses | 308 | 271
Total operating expenses | 2,038 | 1,856
Operating income | 343 | 420
Interest income | 2 | 2
Interest expense | (70) | (69)
Intercompany interest income (expense) | 0 | 0
Intercompany other (expense) income | 0 | 0
Other income (expense) | (10) | 18
Income from continuing operations before income taxes | 265 | 371
Income tax (benefit) expense | 0 | 59
Income from continuing operations | 265 | 312
Income from discontinued operations, net of tax | 40 | 25
(Loss) income before equity in earnings of subsidiaries | 305 | 337
Equity in earnings of subsidiaries, net of tax | 0 | 0
Net income | 305 | 337
Less: Net income attributable to noncontrolling interests | 14 | 12
Net income attributable to Aon shareholders | 291 | 325
Aon plc |  |
Revenue |  |
Total revenue | 0 | 0
Expenses |  |
Compensation and benefits | 52 | 43
Information technology | 0 | 0
Premises | 0 | 0
Depreciation of fixed assets | 0 | 0
Amortization of intangible assets | 0 | 0
Other general expenses | 5 | 7
Total operating expenses | 57 | 50
Operating income | (57) | (50)
Interest income | 0 | 0
Interest expense | (45) | (45)
Intercompany interest income (expense) | 3 | 4
Intercompany other (expense) income | (50) | (54)
Other income (expense) | (10) | 0
Income from continuing operations before income taxes | (159) | (145)
Income tax (benefit) expense | (14) | (26)
Income from continuing operations | (145) | (119)
Income from discontinued operations, net of tax | 0 | 0
(Loss) income before equity in earnings of subsidiaries | (145) | (119)
Equity in earnings of subsidiaries, net of tax | 428 | 444
Net income | 283 | 325
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | 283 | 325
Aon Corporation |  |
Revenue |  |
Total revenue | 0 | 0
Expenses |  |
Compensation and benefits | 6 | 3
Information technology | 0 | 0
Premises | 0 | 0
Depreciation of fixed assets | 0 | 0
Amortization of intangible assets | 0 | 0
Other general expenses | 2 | 2
Total operating expenses | 8 | 5
Operating income | (8) | (5)
Interest income | 6 | 5
Interest expense | (24) | (28)
Intercompany interest income (expense) | (136) | (133)
Intercompany other (expense) income | 7 | 1
Other income (expense) | 12 | (5)
Income from continuing operations before income taxes | (143) | (165)
Income tax (benefit) expense | (54) | (62)
Income from continuing operations | (89) | (103)
Income from discontinued operations, net of tax | 0 | 0
(Loss) income before equity in earnings of subsidiaries | (89) | (103)
Equity in earnings of subsidiaries, net of tax | 271 | 356
Net income | 182 | 253
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | 182 | 253
Other Non-Guarantor Subsidiaries |  |
Revenue |  |
Total revenue | 2,381 | 2,276
Expenses |  |
Compensation and benefits | 1,403 | 1,299
Information technology | 88 | 83
Premises | 84 | 82
Depreciation of fixed assets | 54 | 38
Amortization of intangible assets | 43 | 37
Other general expenses | 301 | 262
Total operating expenses | 1,973 | 1,801
Operating income | 408 | 475
Interest income | (2) | 4
Interest expense | (3) | (3)
Intercompany interest income (expense) | 133 | 129
Intercompany other (expense) income | 43 | 53
Other income (expense) | (20) | 23
Income from continuing operations before income taxes | 559 | 681
Income tax (benefit) expense | 68 | 147
Income from continuing operations | 491 | 534
Income from discontinued operations, net of tax | 40 | 25
(Loss) income before equity in earnings of subsidiaries | 531 | 559
Equity in earnings of subsidiaries, net of tax | 182 | 253
Net income | 713 | 812
Less: Net income attributable to noncontrolling interests | 14 | 12
Net income attributable to Aon shareholders | 699 | 800
Elimination |  |
Revenue |  |
Total revenue | 0 | 0
Expenses |  |
Compensation and benefits | 0 | 0
Information technology | 0 | 0
Premises | 0 | 0
Depreciation of fixed assets | 0 | 0
Amortization of intangible assets | 0 | 0
Other general expenses | 0 | 0
Total operating expenses | 0 | 0
Operating income | 0 | 0
Interest income | (2) | (7)
Interest expense | 2 | 7
Intercompany interest income (expense) | 0 | 0
Intercompany other (expense) income | 0 | 0
Other income (expense) | 8 | 0
Income from continuing operations before income taxes | 8 | 0
Income tax (benefit) expense | 0 | 0
Income from continuing operations | 8 | 0
Income from discontinued operations, net of tax | 0 | 0
(Loss) income before equity in earnings of subsidiaries | 8 | 0
Equity in earnings of subsidiaries, net of tax | (881) | (1,053)
Net income | (873) | (1,053)
Less: Net income attributable to noncontrolling interests | 0 | 0
Net income attributable to Aon shareholders | $ (873) | $ (1,053)

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