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Property, Software and Equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Software and Equipment | Property, Software and Equipment Property, software and equipment consist of the following as of December 31 ($ in millions):
| 2018 |  | 2017
Land | $ | 201 |  |  | $ | 130 |
Building | 614 |  |  | 367 |
Computer software | 757 |  |  | 542 |
Computer hardware | 308 |  |  | 248 |
Furniture and office equipment | 335 |  |  | 186 |
Leasehold improvements | 291 |  |  | 221 |
| 2,506 |  |  | 1,694 |
Less accumulated depreciation | (800 | ) |  | (590 | )
Property, software and equipment, net | $ | 1,706 |  |  | $ | 1,104 |
Depreciation expense for the years ended December 31, 2018, 2017 and 2016 was $237 million, $161 million and $101 million, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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