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Business Segments, Consolidated Revenues and Expenses (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  | $ 6,155.0 | $ 6,307.9 | $ 7,092.5 | $ 7,472.5 | $ 10,190.3 | $ 12,330.2 | $ 12,520.8 | $ 12,909.9 | $ 27,027.9 | $ 47,951.2 | $ 47,727.0
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales | [1] |  |  |  |  |  |  |  |  | 19,612.9 | 40,464.1 | 40,770.2
Other operating costs and expenses | [2] |  |  |  |  |  |  |  |  | 2,449.4 | 2,541.8 | 2,310.4
Depreciation, amortization and accretion |  |  |  |  |  |  |  |  |  | 1,428.2 | 1,282.7 | 1,148.9
Net losses (gains) attributable to asset sales and insurance recoveries |  |  |  |  |  |  |  |  |  | 15.6 | (102.1) | (83.4)
Non-cash asset impairment charges |  |  |  |  |  |  |  |  |  | 162.6 | 34.0 | 92.6
General and administrative costs |  |  |  |  |  |  |  |  |  | 192.6 | 214.5 | 188.3
Total costs and expenses |  |  |  |  |  |  |  |  |  | 23,861.3 | $ 44,435.0 | $ 44,427.0
Shell Oil Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  |  | $ 1,999.3 |  |
Shell Oil Company [Member] | Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Largest non-affiliated customer percentage (in hundredths) |  |  |  |  |  |  |  |  |  | 7.40% | 8.50% |
BP p.l.c. [Member] | Revenues [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Largest non-affiliated customer percentage (in hundredths) |  |  |  |  |  |  |  |  |  |  |  | 9.00%
NGL Pipelines and Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Sales of NGLs and related products |  |  |  |  |  |  |  |  |  | $ 8,044.8 | $ 15,460.1 | $ 15,916.0
Midstream services |  |  |  |  |  |  |  |  |  | 1,743.2 | 1,629.7 | 1,204.2
Total consolidated revenues |  |  |  |  |  |  |  |  |  | 9,788.0 | 17,089.8 | 17,120.2
NGL Pipelines and Services [Member] | Shell Oil Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  |  | 400.4 |  |
Crude Oil Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Sales of crude oil |  |  |  |  |  |  |  |  |  | 9,732.9 | 19,783.9 | 20,371.3
Midstream services |  |  |  |  |  |  |  |  |  | 573.0 | 400.4 | 279.1
Total consolidated revenues |  |  |  |  |  |  |  |  |  | 10,305.9 | 20,184.3 | 20,650.4
Crude Oil Pipelines & Services [Member] | Shell Oil Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  |  | 1,335.8 |  |
Natural Gas Pipelines & Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Sales of natural gas |  |  |  |  |  |  |  |  |  | 1,722.6 | 3,181.7 | 2,571.6
Midstream services |  |  |  |  |  |  |  |  |  | 1,020.7 | 1,022.1 | 966.9
Total consolidated revenues |  |  |  |  |  |  |  |  |  | 2,743.3 | 4,203.8 | 3,538.5
Natural Gas Pipelines & Services [Member] | Shell Oil Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  |  | 48.6 |  |
Petrochemical and Refined Products Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Sales of petrochemicals and refined products |  |  |  |  |  |  |  |  |  | 3,333.5 | 5,575.5 | 5,568.8
Midstream services |  |  |  |  |  |  |  |  |  | 778.4 | 741.0 | 689.7
Total consolidated revenues |  |  |  |  |  |  |  |  |  | 4,111.9 | 6,316.5 | 6,258.5
Petrochemical and Refined Products Services [Member] | Shell Oil Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  |  | 206.5 |  |
Offshore Pipelines And Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Sales of natural gas |  |  |  |  |  |  |  |  |  | 0.0 | 0.3 | 0.5
Sales of crude oil |  |  |  |  |  |  |  |  |  | 3.2 | 8.6 | 5.7
Midstream services |  |  |  |  |  |  |  |  |  | 75.6 | 147.9 | 153.2
Total consolidated revenues |  |  |  |  |  |  |  |  |  | 78.8 | $ 156.8 | $ 159.4
Offshore Pipelines And Services [Member] | Shell Oil Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Consolidated Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  |  | $ 8.0 |  |
[1] | Cost of sales is a component of "Operating costs and expenses," as presented on our Statements of Consolidated Operations. Fluctuations in these amounts are primarily due to changes in energy commodity prices and sales volumes associated with our marketing activities.
[2] | Represents cost of operating our plants, pipelines and other fixed assets, excluding depreciation, amortization and accretion charges.

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