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Commitments and Contingencies Noncancelable Operating Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Minimum commitments |  |  |
2018 | $ 284 |  |
2019 | 268 |  |
2020 | 222 |  |
2021 | 189 |  |
2022 | 123 |  |
Thereafter | 372 |  |
Sublease income |  |  |
2018 | (62) |  |
2019 | (63) |  |
2020 | (50) |  |
2021 | (43) |  |
2022 | (38) |  |
Thereafter | (166) |  |
Net minimum commitments |  |  |
2018 | 222 |  |
2019 | 205 |  |
2020 | 172 |  |
2021 | 146 |  |
2022 | 85 |  |
Thereafter | 206 |  |
Rental expense under operating leases | $ 284 | $ 270 | $ 317

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- Definition Amount of required future sublease rental income receivable in the third fiscal year following the latest fiscal year for noncancelable subleasing arrangements. + References No definition available. + Details
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- Definition Amount of required future sublease rental income receivable in the second fiscal year following the latest fiscal year for noncancelable subleasing arrangements. + References No definition available. + Details
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- Definition Amount of required future sublease rental income receivable after the fifth fiscal year following the latest fiscal year for noncancelable subleasing arrangements. + References No definition available. + Details
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- Definition Amount of required future sublease rental income receivable in the next fiscal year following the latest fiscal year for noncancelable subleasing arrangements. + References No definition available. + Details
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- Definition Amount of required minimum rental payments, net of sublease rent receivable maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + 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 fifth 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 20 -Section 50 -Paragraph 2 -Subparagraph (a) -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 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + 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 fourth 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 20 -Section 50 -Paragraph 2 -Subparagraph (a) -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 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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