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Revenue Recognition - Impacts of ASC 606 on Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 415 | $ 325 | $ 300 | $ 275
Trade accounts receivable, less allowance for doubtful accounts | 1,049 | 997 |  |
Prepaid expenses and other current assets | 760 | 603 |  |
Total current assets | 2,224 | 1,975 |  |
Property and equipment, net | 398 | 390 |  |
Intangible assets, net | 2,143 | 1,882 |  |
Goodwill | 5,702 | 5,590 | 5,373 |
Contract costs, net | 419 | 84 |  |
Other long-term assets | 376 | 368 |  |
Total assets | 11,262 | 10,289 | 9,743 |
Liabilities and Shareholders’ Equity |  |  |  |
Accounts payable and accrued expenses | 1,626 | 1,359 |  |
Current maturities of long-term debt | 4 | 3 |  |
Contract liabilities | 380 |  |  |
Total current liabilities | 2,010 | 1,938 |  |
Long-term debt | 5,955 | 4,897 |  |
Deferred income taxes | 745 | 552 |  |
Long-term contract liabilities | 89 | 54 |  |
Other long-term liabilities | 170 | 117 |  |
Total liabilities | 8,969 | 7,558 |  |
Total shareholders’ equity | 2,293 | 2,731 | $ 2,541 | $ 2,660
Total liabilities and shareholders’ equity | 11,262 | 10,289 |  |
Adjustments | Accounting Standards Update 2014-09 |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Trade accounts receivable, less allowance for doubtful accounts | (11) |  |  |
Prepaid expenses and other current assets | 19 |  |  |
Total current assets | 8 |  |  |
Property and equipment, net | 0 |  |  |
Intangible assets, net | 0 |  |  |
Goodwill | 0 |  |  |
Contract costs, net | (339) |  |  |
Other long-term assets | 102 |  |  |
Total assets | (229) |  |  |
Liabilities and Shareholders’ Equity |  |  |  |
Accounts payable and accrued expenses | (11) |  |  |
Current maturities of long-term debt | 0 |  |  |
Contract liabilities | 101 |  |  |
Total current liabilities | 90 |  |  |
Long-term debt | 0 |  |  |
Deferred income taxes | (82) |  |  |
Long-term contract liabilities | 21 |  |  |
Other long-term liabilities | 0 |  |  |
Total liabilities | 29 |  |  |
Total shareholders’ equity | (258) |  |  |
Total liabilities and shareholders’ equity | (229) |  |  |
Balances without adoption of ASC 606 |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 415 | $ 325 |  |
Trade accounts receivable, less allowance for doubtful accounts | 1,038 |  |  |
Prepaid expenses and other current assets | 779 |  |  |
Total current assets | 2,232 |  |  |
Property and equipment, net | 398 |  |  |
Intangible assets, net | 2,143 |  |  |
Goodwill | 5,702 |  |  |
Contract costs, net | 80 |  |  |
Other long-term assets | 478 |  |  |
Total assets | 11,033 |  |  |
Liabilities and Shareholders’ Equity |  |  |  |
Accounts payable and accrued expenses | 1,615 |  |  |
Current maturities of long-term debt | 4 |  |  |
Contract liabilities | 481 |  |  |
Total current liabilities | 2,100 |  |  |
Long-term debt | 5,955 |  |  |
Deferred income taxes | 663 |  |  |
Long-term contract liabilities | 110 |  |  |
Other long-term liabilities | 170 |  |  |
Total liabilities | 8,998 |  |  |
Total shareholders’ equity | 2,035 |  |  |
Total liabilities and shareholders’ equity | $ 11,033 |  |  |

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