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Accounting for Derivative Instruments and Hedging Activities - Offsetting of derivatives by counterparty master agreement level and collateral received (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid |  |
Derivative assets | $ 1,277 | $ 798
Cash Collateral (Held) / Posted | (72) | (37)
Gross Amounts of Recognized Derivative Liabilities | (994) | (752)
Cash Collateral Posted | 224 | 171
Gross Amounts of Recognized Assets / Liabilities | 283 | 46
Derivative Instruments | 0 | 0
Cash Collateral (Held) / Posted | 48 | 62
Net Amount | 331 | 108
Commodity contracts |  |
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid |  |
Derivative assets | 1,169 | 745
Derivative Instruments | (817) | (578)
Cash Collateral (Held) / Posted | (50) | (11)
Net Amount | 302 | 156
Gross Amounts of Recognized Derivative Liabilities | (971) | (693)
Derivative Instruments | 817 | 578
Cash Collateral Posted | 98 | 73
Net Amount | (56) | (42)
Gross Amounts of Recognized Assets / Liabilities | 198 | 52
Derivative Instruments | 0 | 0
Cash Collateral (Held) / Posted | 48 | 62
Net Amount | 246 | 114
Interest rate contracts |  |
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid |  |
Derivative assets | 108 | 53
Derivative Instruments | (3) | (3)
Cash Collateral (Held) / Posted | 0 | 0
Net Amount | 105 | 50
Gross Amounts of Recognized Derivative Liabilities | (23) | (59)
Derivative Instruments | 3 | 3
Cash Collateral Posted | 0 | 0
Net Amount | (20) | (56)
Gross Amounts of Recognized Assets / Liabilities | 85 | (6)
Derivative Instruments | 0 | 0
Cash Collateral (Held) / Posted | 0 | 0
Net Amount | $ 85 | $ (6)

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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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