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Loans Payable, Long-Term Debt and Leases Loans Payable, Long-Term Debt and Leases - Operating Leases (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Jul. 31, 2019 | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |  |
Weighted-average remaining lease term (in years) | 7 years 6 months |  |
Operating lease cost | $ 83 |  |
Cash payments included in the measurement of operating lease liabilities | 73 |  |
Obligations associated with operating leases not yet commenced | $ 110 |  |
Term for operating lease not yet commenced (in years) | 10 years |  |
2019 |  |  | $ 188
2020 |  |  | 198
2021 |  |  | 150
2022 |  |  | 134
2023 |  |  | 84
Thereafter |  |  | $ 243
Facilities |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Weighted-average remaining lease term (in years) | 8 years |  |
Renewal term (in years) | 4 years |  |
Vehicle |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Average remaining lease term (in years) | 4 years |  |
Forecast |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Obligations associated with operating leases not yet commenced |  | $ 72 |

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- Definition Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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