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Fair Value of Financial Instruments (Recurring FV Measurements - Details 2) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets $ 1,251 $ 2,220
Derivative liabilities 1,378 2,214
Fair Value, Assets And Liabilities, Level 1 to Level 2 Transfers, Amount 0 0
Fair Value, Assets And Liabilities, Level 2 to Level 1 Transfers, Amount 0 0
Commodity contracts    
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets 1,202 2,220
Derivative liabilities 1,290 2,086
Interest rate contracts    
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets 49  
Derivative liabilities 88 128
Fair Value, Measurements, Recurring    
Investment in available-for-sale securities (classified within other non-current assets):    
Debt securities 17 17
Available-for-sale Securities 10 9
Other 10 [1] 14 [2]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 1 1
Total assets 1,899 2,822
Total liabilities 1,378 2,214
Fair Value, Measurements, Recurring | Commodity contracts    
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets 1,202 2,220
Derivative liabilities 1,290 2,086
Fair Value, Measurements, Recurring | Interest rate contracts    
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets 49  
Derivative liabilities 88 128
Fair Value, Measurements, Recurring | Cash and cash equivalents    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 25 6
Fair Value, Measurements, Recurring | U.S. government and federal agency obligations    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 73 55
Fair Value, Measurements, Recurring | Federal agency mortgage-backed securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 62 59
Fair Value, Measurements, Recurring | Commercial mortgage-backed securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 17 25
Fair Value, Measurements, Recurring | Corporate debt securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 84 81
Fair Value, Measurements, Recurring | Equity securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 346 334
Fair Value, Measurements, Recurring | Foreign government fixed income securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 3 1
Fair Value, Measurements, Recurring | Level 1    
Investment in available-for-sale securities (classified within other non-current assets):    
Debt securities 0 0
Available-for-sale Securities 10 9
Other 10 [1] 14 [2]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 1 1
Total assets 969 986
Total liabilities 494 868
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts    
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets 559 622
Derivative liabilities 494 868
Fair Value, Measurements, Recurring | Level 1 | Interest rate contracts    
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets 0  
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Cash and cash equivalents    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 25 6
Fair Value, Measurements, Recurring | Level 1 | U.S. government and federal agency obligations    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 72 54
Fair Value, Measurements, Recurring | Level 1 | Federal agency mortgage-backed securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 1 | Commercial mortgage-backed securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 1 | Equity securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 292 280
Fair Value, Measurements, Recurring | Level 1 | Foreign government fixed income securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 2    
Investment in available-for-sale securities (classified within other non-current assets):    
Debt securities 0 0
Available-for-sale Securities 0 0
Other 0 [1] 0 [2]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 0 0
Total assets 767 1,616
Total liabilities 723 1,164
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts    
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets 551 1,449
Derivative liabilities 635 1,036
Fair Value, Measurements, Recurring | Level 2 | Interest rate contracts    
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets 49  
Derivative liabilities 88 128
Fair Value, Measurements, Recurring | Level 2 | Cash and cash equivalents    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 2 | U.S. government and federal agency obligations    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 1 1
Fair Value, Measurements, Recurring | Level 2 | Federal agency mortgage-backed securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 62 59
Fair Value, Measurements, Recurring | Level 2 | Commercial mortgage-backed securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 17 25
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 84 81
Fair Value, Measurements, Recurring | Level 2 | Equity securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 2 | Foreign government fixed income securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 3 1
Fair Value, Measurements, Recurring | Level 3    
Investment in available-for-sale securities (classified within other non-current assets):    
Debt securities 17 17
Available-for-sale Securities 0 0
Other 0 [1] 0 [2]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value 0 0
Total assets 163 220
Total liabilities 161 182
Fair Value, Measurements, Recurring | Level 3 | Commodity contracts    
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets 92 149
Derivative liabilities 161 182
Fair Value, Measurements, Recurring | Level 3 | Interest rate contracts    
Investment in available-for-sale securities (classified within other non-current assets):    
Derivative assets 0  
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Cash and cash equivalents    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. government and federal agency obligations    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 3 | Federal agency mortgage-backed securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 3 | Commercial mortgage-backed securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 0 0
Fair Value, Measurements, Recurring | Level 3 | Equity securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments 54 54
Fair Value, Measurements, Recurring | Level 3 | Foreign government fixed income securities    
Investment in available-for-sale securities (classified within other non-current assets):    
Trust fund investments $ 0 $ 0
[1] Consists primarily of mutual funds held in a rabbi trust for non-qualified deferred compensation plans for certain key and highly compensated employees and a total return swap that does not meet the definition of a derivative.
[2] Primarily consists of mutual funds held in a rabbi trusts for non-qualified deferred compensation plans for certain former employees and a total return swap that does not meet the definition of a derivative.