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Lease Commitments
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lease Commitments
Lease Commitments
The company enters into leasing arrangements as a lessee; any lessor arrangements are not significant. Operating lease arrangements mainly involve land, bareboat charters, terminals, drill ships, drilling rigs, time chartered vessels, office buildings and warehouses, and exploration and production equipment. Finance leases primarily include facilities, vessels, office buildings, and production equipment.
Details of the right-of-use assets and lease liabilities for operating and finance leases, including the balance sheet presentation, are as follows:
At December 31, 2020At December 31, 2019
Operating
Leases		Finance
Leases		Operating
Leases		Finance
Leases
Deferred charges and other assets$3,949 $— $4,074 $— 
Properties, plant and equipment, net— 455 — 329 
Right-of-use assets1
$3,949 $455 $4,074 $329 
Accrued Liabilities$1,291 $— $1,277 $— 
Short-term Debt— 186 — 18 
Current lease liabilities1,291 186 1,277 18 
Deferred credits and other noncurrent obligations2,615 — 2,608 — 
Long-term Debt— 447 — 282 
Noncurrent lease liabilities2,615 447 2,608 282 
 Total lease liabilities
$3,906 $633 $3,885 $300 
Weighted-average remaining lease term (in years)7.210.45.216.0
Weighted-average discount rate2.8 %3.9 %3.2 %4.7 %
1 Includes non-cash additions of $1,353 and $164 in 2020, and $1,201 and $184 in 2019 for right-of-use assets obtained in exchange for new and modified lease liabilities for operating and finance leases, respectively. 2020 includes $566 in operating lease right-of-use assets and $566 lease liabilities associated with the Puma acquisition. 2020 also includes $124 in operating lease right-of-use assets and $148 lease liabilities, and $112 in finance lease right-of-use assets and $309 lease liabilities associated with the Noble acquisition.
Total lease costs consist of both amounts recognized in the Consolidated Statement of Income during the period and amounts capitalized as part of the cost of another asset. Total lease costs incurred for operating and finance leases were as follows:
Year-ended December 31
20202019
Operating lease costs1, 2
$2,551 $2,621 
Finance lease costs 45 66
Total lease costs
$2,596 $2,687 

1 Net rental expense of $816 for 2018.
2 Includes variable and short-term lease costs.
Cash paid for amounts included in the measurement of lease liabilities was as follows:
Year-ended December 31
20202019
Operating cash flows from operating leases$1,744 $1,574 
Investing cash flows from operating leases762 1,047 
Operating cash flows from finance leases14 13 
Financing cash flows from finance leases34 24 
At December 31, 2020, the estimated future undiscounted cash flows for operating and finance leases were as follows:
At December 31, 2020
Operating LeasesFinance
Leases
Year2021$1,376 $204 
2022779 60 
2023497 58 
2024338 56 
2025255 53 
Thereafter1,112 331 
Total$4,357 $762 
Less: Amounts representing interest451 129 
Total lease liabilities
$3,906 $633 
Additionally, the company has $907 in future undiscounted cash flows for operating leases not yet commenced. These leases are primarily for a drill ship and drilling rigs. For those leasing arrangements where the underlying asset is not yet constructed, the lessor is primarily involved in the design and construction of the asset.
Lease Commitments
Lease Commitments
The company enters into leasing arrangements as a lessee; any lessor arrangements are not significant. Operating lease arrangements mainly involve land, bareboat charters, terminals, drill ships, drilling rigs, time chartered vessels, office buildings and warehouses, and exploration and production equipment. Finance leases primarily include facilities, vessels, office buildings, and production equipment.
Details of the right-of-use assets and lease liabilities for operating and finance leases, including the balance sheet presentation, are as follows:
At December 31, 2020At December 31, 2019
Operating
Leases		Finance
Leases		Operating
Leases		Finance
Leases
Deferred charges and other assets$3,949 $— $4,074 $— 
Properties, plant and equipment, net— 455 — 329 
Right-of-use assets1
$3,949 $455 $4,074 $329 
Accrued Liabilities$1,291 $— $1,277 $— 
Short-term Debt— 186 — 18 
Current lease liabilities1,291 186 1,277 18 
Deferred credits and other noncurrent obligations2,615 — 2,608 — 
Long-term Debt— 447 — 282 
Noncurrent lease liabilities2,615 447 2,608 282 
 Total lease liabilities
$3,906 $633 $3,885 $300 
Weighted-average remaining lease term (in years)7.210.45.216.0
Weighted-average discount rate2.8 %3.9 %3.2 %4.7 %
1 Includes non-cash additions of $1,353 and $164 in 2020, and $1,201 and $184 in 2019 for right-of-use assets obtained in exchange for new and modified lease liabilities for operating and finance leases, respectively. 2020 includes $566 in operating lease right-of-use assets and $566 lease liabilities associated with the Puma acquisition. 2020 also includes $124 in operating lease right-of-use assets and $148 lease liabilities, and $112 in finance lease right-of-use assets and $309 lease liabilities associated with the Noble acquisition.
Total lease costs consist of both amounts recognized in the Consolidated Statement of Income during the period and amounts capitalized as part of the cost of another asset. Total lease costs incurred for operating and finance leases were as follows:
Year-ended December 31
20202019
Operating lease costs1, 2
$2,551 $2,621 
Finance lease costs 45 66
Total lease costs
$2,596 $2,687 

1 Net rental expense of $816 for 2018.
2 Includes variable and short-term lease costs.
Cash paid for amounts included in the measurement of lease liabilities was as follows:
Year-ended December 31
20202019
Operating cash flows from operating leases$1,744 $1,574 
Investing cash flows from operating leases762 1,047 
Operating cash flows from finance leases14 13 
Financing cash flows from finance leases34 24 
At December 31, 2020, the estimated future undiscounted cash flows for operating and finance leases were as follows:
At December 31, 2020
Operating LeasesFinance
Leases
Year2021$1,376 $204 
2022779 60 
2023497 58 
2024338 56 
2025255 53 
Thereafter1,112 331 
Total$4,357 $762 
Less: Amounts representing interest451 129 
Total lease liabilities
$3,906 $633 
Additionally, the company has $907 in future undiscounted cash flows for operating leases not yet commenced. These leases are primarily for a drill ship and drilling rigs. For those leasing arrangements where the underlying asset is not yet constructed, the lessor is primarily involved in the design and construction of the asset.