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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Rental Expense for Property and Equipment Under Operating Lease Agreements | Rental expense for property and equipment under all operating lease agreements is as follows:
(in millions) | Year ended December 31,
| 2017 |  | 2016 |  | 2015
Gross rental expense | $ | 177 |  |  | $ | 179 |  |  | $ | 182 |
Less: sublease revenue | (17 | ) |  | (16 | ) |  | (14 | )
Less: rent credit | — |  |  | — |  |  | (4 | )
Net rental expense | $ | 160 |  |  | $ | 163 |  |  | $ | 164 |
Schedule of Future Minimum Rental Commitments | Cash amounts for future minimum rental commitments under existing non-cancelable leases with a remaining term of more than one year, along with minimum sublease rental income to be received under non-cancelable subleases are shown in the following table.
(in millions) | Rent commitment |  | Sublease income |  | Net rent
2018 | $ | 122 |  |  | $ | (17 | ) |  | $ | 105 |
2019 | 109 |  |  | (17 | ) |  | 92 |
2020 | 83 |  |  | (3 | ) |  | 80 |
2021 | 71 |  |  | — |  |  | 71 |
2022 | 69 |  |  | — |  |  | 69 |
2023 and beyond | 516 |  |  | — |  |  | 516 |
Total | $ | 970 |  |  | $ | (37 | ) |  | $ | 933 |

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- Definition Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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