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Leases - Future Minimum Contractual Operating Lease Obligations (Details) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |
2020 | $ 81 |
2021 | 62 |
2022 | 46 |
2023 | 34 |
2024 | 24 |
Thereafter | 70 |
Total lease payments | 317 |
Less: Imputed interest | (52) |
Present value of lease liabilities | $ 265 |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |
2019 |  | $ 94
2020 |  | 74
2021 |  | 54
2022 |  | 40
2023 |  | 30
2024 |  | 0
Thereafter |  | 87
Total lease payments |  | $ 379

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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