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Accounting Policies (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) units Segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Number of reportable segments | Segment | 3 |  |  |
Market value of cash and cash equivalents | $ 2,779,000,000 | $ 2,392,000,000 | $ 1,481,000,000 | $ 2,497,000,000
Deferred technology costs, gross | 186,000,000 | 145,000,000 |  |
Accumulated amortization of deferred technology costs | 104,000,000 | 91,000,000 |  |
Fair value of our long-term debt borrowings | 3,800,000,000 | 3,700,000,000 |  |
Non-cash impairment charge associated with finite-lived intangible assets | $ 24,000,000 | 24,000,000 |  |
Number of reporting units | units | 4 |  |  |
Cost of advertisement | $ 33,000,000 | 35,000,000 | 33,000,000 |
Undistributed accumulated earnings of foreign subsidiary | $ 2,600,000,000 |  |  |
Percent of undistributed accumulated earnings of foreign subsidiary not to be reinvested (more than) | 70.00% |  |  |
Amount of undistributed accumulated earnings of foreign subsidiary to be reinvested | $ 780,000,000 |  |  |
Income tax benefit from TCJA 2017 | 25,000,000 | 24,000,000 | 3,000,000 |
Goodwill impairment | 0 | 0 | 0 |
Indefinite-lived intangible asset impairment | 0 | 0 | 0 |
Excess tax benefit from share-based compensation, operating activities | 72,000,000 |  |  |
Excess tax benefit from share-based compensation, financing activities | (49,000,000) | (55,000,000) | (92,000,000) |
Employee service share-based compensation, cash payments to settle awards | 49,000,000 |  |  |
Impact of restatement on opening retained earnings | 40,000,000 |  |  |
Capitalized contract costs | 79,000,000 |  |  |
Deferred revenue | 14,000,000 |  |  |
Net impact of recording expense associated with noncurrent deferred revenue | 12,000,000 |  |  |
Increase (decrease) in income taxes | $ 13,000,000 |  |  |
Minimum | Software and Software Development Costs |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment useful life | 3 years |  |  |
Minimum | Building Improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment useful life | 15 years |  |  |
Minimum | Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment useful life | 2 years |  |  |
Maximum | Software and Software Development Costs |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment useful life | 7 years |  |  |
Maximum | Building Improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment useful life | 40 years |  |  |
Maximum | Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment useful life | 10 years |  |  |
Previously Reported |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Excess tax benefit from share-based compensation, financing activities |  | (41,000,000) | (69,000,000) |
Employee service share-based compensation, cash payments to settle awards |  | (55,000,000) | (92,000,000) |
Restatement Adjustment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Excess tax benefit from share-based compensation, operating activities |  | 41,000,000 | 69,000,000 |
Employee service share-based compensation, cash payments to settle awards |  | $ 55,000,000 | $ 92,000,000 |

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