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Revenue Recognition Schedule of Impact to Consolidated Financial Statement Line Items (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues $ 14,144 $ 13,705 $ 13,058
Costs of sales 4,421 4,345 3,429
Operating Income 3,794 3,529 3,538
Natural gas sales [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues 3,281 3,053 2,454
Services [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues 7,931 7,901 8,146
Product sales and other [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues 2,932 $ 2,751 $ 2,458
Accounting Standards Update 2014-09 [Member] | Amounts Without Adoption of Topic 606 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues 14,743    
Costs of sales 5,020    
Operating Income 3,794    
Accounting Standards Update 2014-09 [Member] | Amounts Without Adoption of Topic 606 [Member] | Natural gas sales [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues 3,339    
Accounting Standards Update 2014-09 [Member] | Amounts Without Adoption of Topic 606 [Member] | Services [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues 8,134    
Accounting Standards Update 2014-09 [Member] | Amounts Without Adoption of Topic 606 [Member] | Product sales and other [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues 3,270    
Accounting Standards Update 2014-09 [Member] | Effect of Change Increase/(Decrease) [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues (599)    
Costs of sales (599)    
Operating Income 0    
Accounting Standards Update 2014-09 [Member] | Effect of Change Increase/(Decrease) [Member] | Natural gas sales [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues (58)    
Accounting Standards Update 2014-09 [Member] | Effect of Change Increase/(Decrease) [Member] | Services [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues (203)    
Accounting Standards Update 2014-09 [Member] | Effect of Change Increase/(Decrease) [Member] | Product sales and other [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Total Revenues $ (338)