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New Accounting Guidance - ASC 606 (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues [Abstract] |  |  |  |  |  |  |
Revenue | $ 3,734 | $ 3,495 | $ 7,734 | $ 6,998 |  |  |
Expense: |  |  |  |  |  |  |
Compensation and benefits | 2,135 | 1,998 | 4,359 | 4,003 |  |  |
Other operating expenses | 908 | 796 | 1,776 | 1,545 |  |  |
Operating expenses | 3,043 | 2,794 | 6,135 | 5,548 |  |  |
Operating income | 691 | 701 | 1,599 | 1,450 |  |  |
Other net benefit credits | 65 | 63 | 131 | 123 |  |  |
Interest income | 3 | 2 | 6 | 4 |  |  |
Interest expense | (68) | (60) | (129) | (118) |  |  |
Investment Income | 28 | 5 | 28 | 5 |  |  |
Income before income taxes | 719 | 711 | 1,635 | 1,464 |  |  |
Income tax expense | 183 | 204 | 403 | 379 |  |  |
Net income before non-controlling interests | 536 | 507 | 1,232 | 1,085 |  |  |
Less: Net income attributable to non-controlling interests | 5 | 6 | 11 | 15 |  |  |
Net income attributable to the Company | 531 | 501 | 1,221 | 1,070 |  |  |
Assets |  |  |  |  |  |  |
Cash and cash equivalents | 1,036 | 966 | 1,036 | 966 |  | $ 1,205 | $ 1,026
Net receivables | 4,601 |  | 4,601 |  | $ 4,201 | 4,133 |
Other current assets | 538 |  | 538 |  | 542 | 224 |
Total current assets | 6,175 |  | 6,175 |  |  | 5,562 |
Fixed assets, net | 698 |  | 698 |  |  | 712 |
Pension related assets | 1,808 |  | 1,808 |  |  | 1,693 |
Deferred tax assets | 532 |  | 532 |  | 552 | 669 |
Total assets | 21,159 |  | 21,159 |  |  | 20,429 |
Liabilities |  |  |  |  |  |  |
Short-term debt | 439 |  | 439 |  |  | 262 |
Accounts payable and accrued liabilities | 2,246 |  | 2,246 |  | 2,205 | 2,083 |
Accrued compensation and employee benefits | 1,103 |  | 1,103 |  |  | 1,718 |
Accrued income taxes | 216 |  | 216 |  |  | 199 |
Dividends payable | 212 |  | 212 |  |  | 0 |
Total current liabilities | 4,216 |  | 4,216 |  |  | 4,262 |
Fiduciary liabilities | 5,118 |  | 5,118 |  |  | 4,847 |
Less – cash and investments held in a fiduciary capacity | (5,118) |  | (5,118) |  |  | (4,847) |
Fiduciary Liabilities, Net, Noncurrent | 0 |  | 0 |  |  | 0 |
Long-term debt | 5,813 |  | 5,813 |  |  | 5,225 |
Pension, post-retirement and post-employment benefits | 1,768 |  | 1,768 |  |  | 1,888 |
Liabilities for errors and omissions | 303 |  | 303 |  |  | 301 |
Other liabilities | 1,262 |  | 1,262 |  | 1,334 | 1,311 |
Equity [Abstract] |  |  |  |  |  |  |
Retained earnings | 14,131 |  | 14,131 |  | 13,504 | 13,140 |
Total equity | 7,797 | 7,074 | 7,797 | 7,074 |  | 7,442 |
Total liabilities and stockholders' equity | 21,159 |  | 21,159 |  |  | $ 20,429 |
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |
Net income before non-controlling interests | 536 | $ 507 | 1,232 | 1,085 |  |  |
Depreciation and amortization of fixed assets and capitalized software |  |  | 159 | 156 |  |  |
Amortization of intangible assets |  |  | 88 | 80 |  |  |
Adjustments and payments related to contingent consideration liability |  |  | 2 | (13) |  |  |
Provision for deferred income taxes |  |  | 34 | 42 |  |  |
(Gain) loss on investments |  |  | (28) | (5) |  |  |
(Gain) loss on disposition of assets |  |  | (1) | 9 |  |  |
Share-based compensation expense |  |  | 99 | 75 |  |  |
Net receivables |  |  | (388) | (318) |  |  |
Other current assets |  |  | 4 | (18) |  |  |
Other assets |  |  | (10) | (34) |  |  |
Accounts payable and accrued liabilities |  |  | 30 | 52 |  |  |
Accrued compensation and employee benefits |  |  | (614) | (579) |  |  |
Accrued income taxes |  |  | 18 | 45 |  |  |
Contributions to pension and other benefit plans in excess of current year expense/credit |  |  | (178) | (214) |  |  |
Other liabilities |  |  | (10) | 9 |  |  |
Effect of exchange rate changes |  |  | (24) | (29) |  |  |
Net cash provided by operations |  |  | 413 | $ 343 |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Revenue | 3,734 |  | 7,734 |  |  |  |
Expense: |  |  |  |  |  |  |
Compensation and benefits | 2,135 |  | 4,359 |  |  |  |
Other operating expenses | 908 |  | 1,776 |  |  |  |
Operating expenses | 3,043 |  | 6,135 |  |  |  |
Operating income | 691 |  | 1,599 |  |  |  |
Other net benefit credits | 65 |  | 131 |  |  |  |
Interest income | 3 |  | 6 |  |  |  |
Interest expense | (68) |  | (129) |  |  |  |
Investment Income | 28 |  | 28 |  |  |  |
Income before income taxes | 719 |  | 1,635 |  |  |  |
Income tax expense | 183 |  | 403 |  |  |  |
Net income before non-controlling interests | 536 |  | 1,232 |  |  |  |
Less: Net income attributable to non-controlling interests | 5 |  | 11 |  |  |  |
Net income attributable to the Company | 531 |  | 1,221 |  |  |  |
Assets |  |  |  |  |  |  |
Cash and cash equivalents | 1,036 |  | 1,036 |  |  |  |
Net receivables | 4,601 |  | 4,601 |  | 68 |  |
Other current assets | 538 |  | 538 |  | 318 |  |
Total current assets | 6,175 |  | 6,175 |  |  |  |
Goodwill and intangible assets | 10,411 |  | 10,411 |  |  |  |
Fixed assets, net | 698 |  | 698 |  |  |  |
Pension related assets | 1,808 |  | 1,808 |  |  |  |
Deferred tax assets | 532 |  | 532 |  | (103) |  |
Other assets | 1,535 |  | 1,535 |  |  |  |
Total assets | 21,159 |  | 21,159 |  |  |  |
Liabilities |  |  |  |  |  |  |
Short-term debt | 439 |  | 439 |  |  |  |
Accounts payable and accrued liabilities | 2,246 |  | 2,246 |  | 122 |  |
Accrued compensation and employee benefits | 1,103 |  | 1,103 |  |  |  |
Accrued income taxes | 216 |  | 216 |  |  |  |
Dividends payable | 212 |  | 212 |  |  |  |
Total current liabilities | 4,216 |  | 4,216 |  |  |  |
Fiduciary liabilities | 5,118 |  | 5,118 |  |  |  |
Less – cash and investments held in a fiduciary capacity | (5,118) |  | (5,118) |  |  |  |
Fiduciary Liabilities, Net, Noncurrent | 0 |  | 0 |  |  |  |
Long-term debt | 5,813 |  | 5,813 |  |  |  |
Pension, post-retirement and post-employment benefits | 1,768 |  | 1,768 |  |  |  |
Liabilities for errors and omissions | 303 |  | 303 |  |  |  |
Other liabilities | 1,262 |  | 1,262 |  | 23 |  |
Equity [Abstract] |  |  |  |  |  |  |
Retained earnings | 364 |  | 364 |  | $ 364 |  |
Total equity | 7,797 |  | 7,797 |  |  |  |
Total liabilities and stockholders' equity | 21,159 |  | 21,159 |  |  |  |
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |
Net income before non-controlling interests |  |  | 1,232 |  |  |  |
Depreciation and amortization of fixed assets and capitalized software |  |  | 159 |  |  |  |
Amortization of intangible assets |  |  | 88 |  |  |  |
Adjustments and payments related to contingent consideration liability |  |  | 2 |  |  |  |
Provision for deferred income taxes |  |  | 34 |  |  |  |
(Gain) loss on investments |  |  | (28) |  |  |  |
(Gain) loss on disposition of assets |  |  | (1) |  |  |  |
Share-based compensation expense |  |  | 99 |  |  |  |
Net receivables |  |  | (388) |  |  |  |
Other current assets |  |  | 4 |  |  |  |
Other assets |  |  | (10) |  |  |  |
Accounts payable and accrued liabilities |  |  | 30 |  |  |  |
Accrued compensation and employee benefits |  |  | (614) |  |  |  |
Accrued income taxes |  |  | 18 |  |  |  |
Contributions to pension and other benefit plans in excess of current year expense/credit |  |  | (178) |  |  |  |
Other liabilities |  |  | (10) |  |  |  |
Effect of exchange rate changes |  |  | (24) |  |  |  |
Net cash provided by operations |  |  | 413 |  |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Revenue | 3,710 |  | 7,549 |  |  |  |
Expense: |  |  |  |  |  |  |
Compensation and benefits | 2,125 |  | 4,289 |  |  |  |
Other operating expenses | 908 |  | 1,776 |  |  |  |
Operating expenses | 3,033 |  | 6,065 |  |  |  |
Operating income | 677 |  | 1,484 |  |  |  |
Other net benefit credits | 65 |  | 131 |  |  |  |
Interest income | 3 |  | 6 |  |  |  |
Interest expense | (68) |  | (129) |  |  |  |
Investment Income | 28 |  | 28 |  |  |  |
Income before income taxes | 705 |  | 1,520 |  |  |  |
Income tax expense | 179 |  | 373 |  |  |  |
Net income before non-controlling interests | 526 |  | 1,147 |  |  |  |
Less: Net income attributable to non-controlling interests | 5 |  | 11 |  |  |  |
Net income attributable to the Company | 521 |  | 1,136 |  |  |  |
Assets |  |  |  |  |  |  |
Cash and cash equivalents | 1,036 |  | 1,036 |  |  |  |
Net receivables | 4,347 |  | 4,347 |  |  |  |
Other current assets | 240 |  | 240 |  |  |  |
Total current assets | 5,623 |  | 5,623 |  |  |  |
Goodwill and intangible assets | 10,411 |  | 10,411 |  |  |  |
Fixed assets, net | 698 |  | 698 |  |  |  |
Pension related assets | 1,808 |  | 1,808 |  |  |  |
Deferred tax assets | 665 |  | 665 |  |  |  |
Other assets | 1,305 |  | 1,305 |  |  |  |
Total assets | 20,510 |  | 20,510 |  |  |  |
Liabilities |  |  |  |  |  |  |
Short-term debt | 439 |  | 439 |  |  |  |
Accounts payable and accrued liabilities | 2,069 |  | 2,069 |  |  |  |
Accrued compensation and employee benefits | 1,103 |  | 1,103 |  |  |  |
Accrued income taxes | 216 |  | 216 |  |  |  |
Dividends payable | 212 |  | 212 |  |  |  |
Total current liabilities | 4,039 |  | 4,039 |  |  |  |
Fiduciary liabilities | 5,118 |  | 5,118 |  |  |  |
Less – cash and investments held in a fiduciary capacity | (5,118) |  | (5,118) |  |  |  |
Fiduciary Liabilities, Net, Noncurrent | 0 |  | 0 |  |  |  |
Long-term debt | 5,813 |  | 5,813 |  |  |  |
Pension, post-retirement and post-employment benefits | 1,768 |  | 1,768 |  |  |  |
Liabilities for errors and omissions | 303 |  | 303 |  |  |  |
Other liabilities | 1,239 |  | 1,239 |  |  |  |
Equity [Abstract] |  |  |  |  |  |  |
Total equity | 7,348 |  | 7,348 |  |  |  |
Total liabilities and stockholders' equity | 20,510 |  | 20,510 |  |  |  |
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |
Net income before non-controlling interests |  |  | 1,147 |  |  |  |
Depreciation and amortization of fixed assets and capitalized software |  |  | 159 |  |  |  |
Amortization of intangible assets |  |  | 88 |  |  |  |
Adjustments and payments related to contingent consideration liability |  |  | 2 |  |  |  |
Provision for deferred income taxes |  |  | 34 |  |  |  |
(Gain) loss on investments |  |  | (28) |  |  |  |
(Gain) loss on disposition of assets |  |  | (1) |  |  |  |
Share-based compensation expense |  |  | 99 |  |  |  |
Net receivables |  |  | (202) |  |  |  |
Other current assets |  |  | (16) |  |  |  |
Other assets |  |  | (36) |  |  |  |
Accounts payable and accrued liabilities |  |  | (25) |  |  |  |
Accrued compensation and employee benefits |  |  | (614) |  |  |  |
Accrued income taxes |  |  | 18 |  |  |  |
Contributions to pension and other benefit plans in excess of current year expense/credit |  |  | (178) |  |  |  |
Other liabilities |  |  | (10) |  |  |  |
Effect of exchange rate changes |  |  | (24) |  |  |  |
Net cash provided by operations |  |  | 413 |  |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |
Revenue | (24) |  | (185) |  |  |  |
Expense: |  |  |  |  |  |  |
Compensation and benefits | (10) |  | (70) |  |  |  |
Other operating expenses | 0 |  | 0 |  |  |  |
Operating expenses | (10) |  | (70) |  |  |  |
Operating income | (14) |  | (115) |  |  |  |
Other net benefit credits | 0 |  | 0 |  |  |  |
Interest income | 0 |  | 0 |  |  |  |
Interest expense | 0 |  | 0 |  |  |  |
Investment Income | 0 |  | 0 |  |  |  |
Income before income taxes | (14) |  | (115) |  |  |  |
Income tax expense | (4) |  | (30) |  |  |  |
Net income before non-controlling interests | (10) |  | (85) |  |  |  |
Less: Net income attributable to non-controlling interests | 0 |  | 0 |  |  |  |
Net income attributable to the Company | (10) |  | (85) |  |  |  |
Assets |  |  |  |  |  |  |
Cash and cash equivalents | 0 |  | 0 |  |  |  |
Net receivables | (254) |  | (254) |  |  |  |
Other current assets | (298) |  | (298) |  |  |  |
Total current assets | (552) |  | (552) |  |  |  |
Goodwill and intangible assets | 0 |  | 0 |  |  |  |
Fixed assets, net | 0 |  | 0 |  |  |  |
Pension related assets | 0 |  | 0 |  |  |  |
Deferred tax assets | 133 |  | 133 |  |  |  |
Other assets | (230) |  | (230) |  |  |  |
Total assets | (649) |  | (649) |  |  |  |
Liabilities |  |  |  |  |  |  |
Short-term debt | 0 |  | 0 |  |  |  |
Accounts payable and accrued liabilities | (177) |  | (177) |  |  |  |
Accrued compensation and employee benefits | 0 |  | 0 |  |  |  |
Accrued income taxes | 0 |  | 0 |  |  |  |
Dividends payable | 0 |  | 0 |  |  |  |
Total current liabilities | (177) |  | (177) |  |  |  |
Fiduciary liabilities | 0 |  | 0 |  |  |  |
Less – cash and investments held in a fiduciary capacity | 0 |  | 0 |  |  |  |
Fiduciary Liabilities, Net, Noncurrent | 0 |  | 0 |  |  |  |
Long-term debt | 0 |  | 0 |  |  |  |
Pension, post-retirement and post-employment benefits | 0 |  | 0 |  |  |  |
Liabilities for errors and omissions | 0 |  | 0 |  |  |  |
Other liabilities | (23) |  | (23) |  |  |  |
Equity [Abstract] |  |  |  |  |  |  |
Total equity | (449) |  | (449) |  |  |  |
Total liabilities and stockholders' equity | $ (649) |  | (649) |  |  |  |
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |
Net income before non-controlling interests |  |  | (85) |  |  |  |
Depreciation and amortization of fixed assets and capitalized software |  |  | 0 |  |  |  |
Amortization of intangible assets |  |  | 0 |  |  |  |
Adjustments and payments related to contingent consideration liability |  |  | 0 |  |  |  |
Provision for deferred income taxes |  |  | 0 |  |  |  |
(Gain) loss on investments |  |  | 0 |  |  |  |
(Gain) loss on disposition of assets |  |  | 0 |  |  |  |
Share-based compensation expense |  |  | 0 |  |  |  |
Net receivables |  |  | 186 |  |  |  |
Other current assets |  |  | (20) |  |  |  |
Other assets |  |  | (26) |  |  |  |
Accounts payable and accrued liabilities |  |  | (55) |  |  |  |
Accrued compensation and employee benefits |  |  | 0 |  |  |  |
Accrued income taxes |  |  | 0 |  |  |  |
Contributions to pension and other benefit plans in excess of current year expense/credit |  |  | 0 |  |  |  |
Other liabilities |  |  | 0 |  |  |  |
Effect of exchange rate changes |  |  | 0 |  |  |  |
Net cash provided by operations |  |  | $ 0 |  |  |  |

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