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Investments in Unconsolidated Entities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity and cost method investments      
Capital contributions, loans, advances and adjustments $ 105 $ 108  
Cumulative share of income 1,717 1,577  
Cumulative share of distributions (1,411) (1,276)  
Total equity method investments 411 409  
Cost method investments 4 4  
Total investments in unconsolidated entities 415 413  
Equity method investments, combined assets      
Current 668 739  
Due from affiliates 323 387  
Property and other 4,804 4,615  
Total assets 5,795 5,741  
Equity method investments, combined liabilities and equity      
Current liabilities 435 466  
Deferred credits 176 184  
Long-term liabilities 199 187  
Long-term capital lease obligations 1 6  
Partners' capital and shareholders' equity 4,984 4,898  
Total liabilities and equity 5,795 5,741  
Equity method investments, combined income statements      
Revenues 6,562 6,747 $ 6,958
Operating expenses 4,965 5,047 5,226
Operating income 1,597 1,700 1,732
Other income (expense), net (1) (11) (7)
Net income $ 1,596 $ 1,689 $ 1,725