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Lease Commitments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Rental expenses for operating leases |  |  |
Rental expense | $ 400 | $ 454 | $ 455
Less: Sub lease rental income | (64) | (83) | (75)
Net rental expense | 336 | $ 371 | $ 380
Future minimum rental payments under operating leases |  |  |
Gross rental commitment 2017 | 355 |  |
Gross rental commitment 2018 | 317 |  |
Gross rental commitment 2019 | 283 |  |
Gross rental commitment 2020 | 237 |  |
Gross rental commitment 2021 | 214 |  |
Gross rental commitment thereafter | 696 |  |
Total gross rental commitments | 2,102 |  |
Sublease income 2017 | (55) |  |
Sublease income 2018 | (44) |  |
Sublease income 2019 | (38) |  |
Sublease income 2020 | (34) |  |
Sublease income 2021 | (33) |  |
Sublease income thereafter | (47) |  |
Total future sublease income | (251) |  |
Net rental commitment 2017 | 300 |  |
Net rental commitment 2018 | 273 |  |
Net rental commitment 2019 | 245 |  |
Net rental commitment 2020 | 203 |  |
Net rental commitment 2021 | 181 |  |
Net rental commitment thereafter | 649 |  |
Total minimum payments required | $ 1,851 |  |

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- Definition For leases having an initial or remaining non-cancelable letter-terms in excess of one year, required rental payments due within one year of the balance sheet date, net of sublease rental income, relating to leases defined as operating. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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