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Leases (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) renewal_option | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Operating Leased Assets [Line Items] |  |  |
Percentage of lease obligations | 85.00% |  |
Term of contract | 12 months |  |
Renewal term increments | 1 year |  |
Operating lease ROU asset amortization | $ 38 |  |
Other noncash operating lease costs | 16 |  |
Rent expense on operating leases under previous lease standard |  | $ 144 | $ 139
Short-term lease commitments | $ 77 |  |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
Operating leases, future minimum payments due |  | 367 |
2019 |  | 76 |
2020 |  | 48 |
2021 |  | 39 |
2022 |  | 32 |
2023 |  | 29 |
Thereafter |  | $ 143 |
Minimum |  |  |
Operating Leased Assets [Line Items] |  |  |
Number of renewal options | renewal_option | 1 |  |

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- Definition Term of lessee's operating lease, 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + 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://fasb.org/us-gaap/role/ref/otherTransitionRef -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://fasb.org/us-gaap/role/ref/otherTransitionRef -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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