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Commitments and Contingencies - Leases (Details) £ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2003 GBP (£) | Dec. 31, 2017 USD ($) lease | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Primary Capital Leases |  |  |  |  |
Capital lease obligation |  | $ 73 |  |  |
Minimum lease payments under capital leases |  |  |  |  |
2018 |  | 12 |  |  |
2019 |  | 10 |  |  |
2020 |  | 9 |  |  |
2021 |  | 6 |  |  |
2022 |  | 5 |  |  |
After 2022 |  | 34 |  |  |
Total |  | 76 |  |  |
Less: Amounts representing interest |  | 3 |  |  |
Less: Current obligations under capital leases |  | 13 |  |  |
Long-term obligations under capital leases |  | 60 | $ 45 |  |
Minimum lease payments under operating leases |  |  |  |  |
2018 |  | 258 |  |  |
2019 |  | 212 |  |  |
2020 |  | 160 |  |  |
2021 |  | 106 |  |  |
2022 |  | 88 |  |  |
After 2022 |  | 274 |  |  |
Total |  | 1,098 |  |  |
Capital and Operating Leases: |  |  |  |  |
Rental expense under operating leases |  | $ 343 | 318 | $ 316 |
Number of primary capital leases | lease |  | 2 |  |  |
Capital and operating leases with non-cancelable terms, low end of range |  | 1 year |  |  |
Building in United Kingdom |  |  |  |  |
Primary Capital Leases |  |  |  |  |
Capital lease term (in years) | 22 years |  |  |  |
Capital lease obligation | £ 33.5 | $ 27 |  |  |
City of Nevada, MO leaseback capital lease obligation |  |  |  |  |
Primary Capital Leases |  |  |  |  |
Capital lease term (in years) |  | 15 years |  |  |
Capital lease obligation |  | $ 13 | $ 12 |  | $ 15

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- Definition Amount of capital lease obligation due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45023-112735 + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45023-112735 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of minimum lease payments for capital leases 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 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases due in the second 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 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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