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Leases (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Lessee, Lease, Description [Line Items] |  |  |
Operating Lease, Expense | $ 323 |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 123 |  |
Operating Lease, Right-of-Use Asset | 1,252 | $ 1,700 | $ 0
Operating Lease, Liability, Current | 245 |  | 0
Operating Lease, Liability, Noncurrent | $ 1,093 |  | $ 0
Operating Lease, Weighted Average Remaining Lease Term | 8 years 7 months 6 days |  |
Operating Lease, Weighted Average Discount Rate, Percent | 3.50% |  |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | $ 298 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two | 265 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three | 196 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four | 147 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five | 120 |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 595 |  |
Lessee, Operating Lease, Liability, Payments, Due | 1,621 |  |
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 283 |  |
Operating Lease, Liability | 1,338 | $ 1,700 |
Operating Lease, Payments | 411 |  |
Accrued Liabilities [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating Lease, Liability, Current | $ 245 |  |

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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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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year. + 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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