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Investment in Unconsolidated Entities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equity and cost method investments      
Capital contributions, loans, advances and adjustments $ 118 $ 123  
Cumulative share of income 1,613 1,468  
Cumulative share of distributions (1,298) (1,205)  
Total equity method investments 433 386  
Cost method investments 18 16  
Total investments in unconsolidated entities 451 402 $ 322
Equity method investments, combined assets      
Current 776 671  
Due from affiliates 386 89  
Property and other 4,666 4,604  
Total assets 5,828 5,364  
Equity method investments, combined liabilities and equity      
Current liabilities 468 810  
Deferred credits 189 242  
Long-term liabilities 197 158  
Long-term capital lease obligations 6 2  
Partners' capital and shareholders' equity 4,968 4,152  
Total liabilities and equity 5,828 5,364  
Equity method investments, combined income statements      
Revenues 6,769 6,979 6,700
Operating expenses 5,068 5,245 5,064
Operating income 1,701 1,734 1,636
Other income (expense), net (13) (9) 7
Net income $ 1,688 $ 1,725 $ 1,643