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Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Leased Assets [Line Items] |  |  |
Lessee, leases not yet commenced, amount | $ 70 |  |
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months | 84 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two | 71 |  |
Operating Lease, Payments | $ 77 |  |
Operating Lease, Weighted Average Remaining Lease Term | 5 years 9 months 18 days |  |
Operating Lease, Right-of-Use Asset | $ 336 | $ 0 | $ 0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 137 |  |
Rent Expense, Net | 80 | 92 | $ 88
Leases, Future Minimum Payments Due, Next Twelve Months | 73 |  |
Total leased assets | $ 67 |  |
Finance Lease, Weighted Average Remaining Lease Term | 3.70% |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three | $ 59 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four | 48 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five | 41 |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 79 |  |
Lessee, Operating Lease, Liability, Payments, Due | 382 |  |
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 39 |  |
Operating Lease, Liability | 343 |  |
Operating Leases, Future Minimum Payments, Due in Two Years | 61 |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 47 |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 39 |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 31 |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 111 |  |
Operating Leases, Future Minimum Payments Due | 362 |  |
Operating Lease, Liability, Noncurrent | $ 276 | $ 0 |
Minimum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 1 year |  |
Maximum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Lessee, Operating Lease, Term of Contract | 60 years |  |
Lessee, Operating and Finance Leases, Option to Extend | 10 years |  |
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract | 15 years |  |

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- Definition Weighted average discount rate for finance lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: 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 + Details
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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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