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Leases | 12 Months Ended
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Dec. 31, 2016
Leases [Abstract] |
Leases | Leases We lease some of our office space under non-cancelable operating leases with third parties and sublease office space to third parties. Some of our lease agreements contain renewal options and escalation clauses based on increases in property taxes and building operating costs. As of December 31, 2016, future minimum lease payments under non-cancelable operating leases (net of sublease income) are as follows:
| Gross Lease Commitments |  | Sublease Income |  | Net Lease Commitments
| (in millions)
Year ending December 31: |  |
2017 | $ | 76 |  |  | $ | 3 |  |  | $ | 73 |
2018 | 73 |  |  | 3 |  |  | 70 |
2019 | 67 |  |  | 3 |  |  | 64 |
2020 | 57 |  |  | 3 |  |  | 54 |
2021 | 46 |  |  | 3 |  |  | 43 |
Thereafter | 113 |  |  | 5 |  |  | 108 |
Total future minimum lease payments | $ | 432 |  |  | $ | 20 |  |  | $ | 412 |
Rent expense for operating leases (net of sublease income of $4 million in 2016, $5 million in 2015 and $4 million in 2014) was $78 million in 2016, $88 million in 2015 and $93 million in 2014.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: 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=6452660&loc=d3e36991-112694 Reference 3: 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=6453985&loc=d3e41499-112717 Reference 4: 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=6584154&loc=d3e38371-112697 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=6851643&loc=d3e12069-110248 Reference 6: 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=6453985&loc=d3e41502-112717 + Details
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