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Goodwill Goodwill (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2015
USD ($)
Multiple
Jan. 01, 2021
$ / MMBbls
Jan. 01, 2021
$ / Bcf
Jan. 01, 2018
$ / Unit
Jan. 01, 2016
$ / MMBbls
Jan. 01, 2016
$ / Bcf
Jan. 01, 2016
$ / Unit
Goodwill [Line Items]                
Marketable Securities | $   $ 0.36            
Implied Control Premium   34.00%            
Goodwill, Fair Value Disclosure | $   $ 0.12            
Weighted Average Discount Rate, Percent 8.00%              
Derivative, Basis Spread on Variable Rate   10000.00%            
Fair Value Inputs, Discount Rate   5.00%            
Forward commodity price curve   5 years            
Term of projection   6 years            
Derivative, Forward Price           38 2.50 0
Average spread   5 years            
Rate of return   0.00%            
Natural Gas Pipelines Regulated                
Goodwill [Line Items]                
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount   3.00%            
Products Pipelines Terminals                
Goodwill [Line Items]                
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount   104.00%            
CO2                
Goodwill [Line Items]                
EBITDA multiple | Multiple   7.9            
Natural Gas Pipelines Non-Regulated                
Goodwill [Line Items]                
EBITDA multiple | Multiple   14.0            
Goodwill, Fair Value Disclosure | $   $ 4,215,000,000            
Carrying value of reporting unit | $   $ 19,000,000,000            
Median enterprise value [Member] | CO2                
Goodwill [Line Items]                
EBITDA multiple | Multiple   12.7            
Discounted cash flow analysis [Member] | CO2                
Goodwill [Line Items]                
EBITDA multiple | Multiple   4.1            
Weighted Average [Member] | CO2                
Goodwill [Line Items]                
EBITDA multiple | Multiple   5.1            
Market Approach Valuation Technique [Member] | Natural Gas Pipelines Non-Regulated                
Goodwill [Line Items]                
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount   18.00%            
Income Approach Valuation Technique [Member] | Natural Gas Pipelines Non-Regulated                
Goodwill [Line Items]                
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount   4.00%            
Goodwill, Fair Value Disclosure | $   $ 17,200,000,000            
Subsequent Event [Member]                
Goodwill [Line Items]                
Derivative, Forward Price     65 3.50 0