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Derivative Financial Instruments - Net Derivatives (Details) - Not Designated as Hedging Instrument [Member] $ in Millions | Jun. 30, 2017 USD ($)
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Assets |
Gross Amount | $ 3
Gross Amounts Offset in the Consolidated Balance Sheets | (1)
Net Amount of Assets in the Consolidated Balance Sheets | 2
Liabilities |
Gross Amount | (44)
Gross Amounts Offset in the Consolidated Balance Sheets | 1
Net Amount of Liabilities in the Consolidated Balance Sheets | (43)
Current Assets [Member] |
Assets |
Gross Amount | 3
Gross Amounts Offset in the Consolidated Balance Sheets | (1)
Net Amount of Assets in the Consolidated Balance Sheets | 2
Current Assets [Member] | Commodity contracts |
Assets |
Gross Amount | 3
Gross Amounts Offset in the Consolidated Balance Sheets | (1)
Net Amount of Assets in the Consolidated Balance Sheets | 2
Current Assets [Member] | Embedded derivatives in commodity contracts |
Assets |
Gross Amount | 0
Gross Amounts Offset in the Consolidated Balance Sheets | 0
Net Amount of Assets in the Consolidated Balance Sheets | 0
Current Liabilities [Member] |
Liabilities |
Gross Amount | (7)
Gross Amounts Offset in the Consolidated Balance Sheets | 1
Net Amount of Liabilities in the Consolidated Balance Sheets | (6)
Current Liabilities [Member] | Commodity contracts |
Liabilities |
Gross Amount | (1)
Gross Amounts Offset in the Consolidated Balance Sheets | 1
Net Amount of Liabilities in the Consolidated Balance Sheets | 0
Current Liabilities [Member] | Embedded derivatives in commodity contracts |
Liabilities |
Gross Amount | (6)
Gross Amounts Offset in the Consolidated Balance Sheets | 0
Net Amount of Liabilities in the Consolidated Balance Sheets | (6)
Non Current Assets [Member] |
Assets |
Gross Amount | 0
Gross Amounts Offset in the Consolidated Balance Sheets | 0
Net Amount of Assets in the Consolidated Balance Sheets | 0
Non Current Assets [Member] | Commodity contracts |
Assets |
Gross Amount | 0
Gross Amounts Offset in the Consolidated Balance Sheets | 0
Net Amount of Assets in the Consolidated Balance Sheets | 0
Non Current Assets [Member] | Embedded derivatives in commodity contracts |
Assets |
Gross Amount | 0
Gross Amounts Offset in the Consolidated Balance Sheets | 0
Net Amount of Assets in the Consolidated Balance Sheets | 0
Non Current Liabilities [Member] |
Liabilities |
Gross Amount | (37)
Gross Amounts Offset in the Consolidated Balance Sheets | 0
Net Amount of Liabilities in the Consolidated Balance Sheets | (37)
Non Current Liabilities [Member] | Commodity contracts |
Liabilities |
Gross Amount | 0
Gross Amounts Offset in the Consolidated Balance Sheets | 0
Net Amount of Liabilities in the Consolidated Balance Sheets | 0
Non Current Liabilities [Member] | Embedded derivatives in commodity contracts |
Liabilities |
Gross Amount | (37)
Gross Amounts Offset in the Consolidated Balance Sheets | 0
Net Amount of Liabilities in the Consolidated Balance Sheets | $ (37)

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