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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | $ 187 |  | $ 187 |  | $ 90
Liability Derivatives Fair Value | (672) |  | (672) |  | (425)
Net loss deferred in AOCI | 173 |  | 173 |  |
Net loss expected to be reclassified to earnings in the next twelve months |  |  | 8 |  |
Interest Rate Derivatives |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Unrealized gain (loss) on hedges | 13 | $ (19) | 45 | $ (12) |
Derivatives in Hedging Relationships |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 5 |  | 5 |  | 2
Liability Derivatives Fair Value | (5) |  | (5) |  | (38)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current assets |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 5 |  | 5 |  |
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other current liabilities |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value |  |  |  |  | 2
Liability Derivatives Fair Value |  |  |  |  | (27)
Derivatives in Hedging Relationships | Interest Rate Derivatives | Other long-term liabilities and deferred credits |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Liability Derivatives Fair Value | (5) |  | (5) |  | (11)
Derivatives Not Designated as a Hedge |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 182 |  | 182 |  | 88
Liability Derivatives Fair Value | (667) |  | (667) |  | (387)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current assets |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 133 |  | 133 |  | 73
Liability Derivatives Fair Value | (487) |  | (487) |  | (227)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term assets, net |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 10 |  | 10 |  | 1
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other current liabilities |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 25 |  | 25 |  | 5
Liability Derivatives Fair Value | (128) |  | (128) |  | (131)
Derivatives Not Designated as a Hedge | Commodity Derivatives | Other long-term liabilities and deferred credits |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 13 |  | 13 |  | 3
Liability Derivatives Fair Value | (27) |  | (27) |  | (5)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current assets |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value |  |  |  |  | 6
Liability Derivatives Fair Value |  |  |  |  | (2)
Derivatives Not Designated as a Hedge | Foreign Currency Derivatives | Other current liabilities |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Asset Derivatives Fair Value | 1 |  | 1 |  |
Liability Derivatives Fair Value | (8) |  | (8) |  |
Derivatives Not Designated as a Hedge | Preferred Distribution Rate Reset Option | Other long-term liabilities and deferred credits |  |  |  |  |
Derivative assets and liabilities |  |  |  |  |
Liability Derivatives Fair Value | $ (17) |  | $ (17) |  | $ (22)

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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