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Risk Management Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | $ 551 | $ 458
Liability derivatives | (171) | (172)
Energy Related Derivative |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 157 | 33
Liability derivatives | (11) | (59)
Interest rate contract |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 126 | 190
Liability derivatives | (108) | (50)
Currency Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 191 | 160
Liability derivatives | 0 | 0
Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 529 | 450
Liability derivatives | (166) | (148)
Designated as Hedging Instrument [Member] | Energy Related Derivative |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 199 | 79
Liability derivatives | (45) | (77)
Designated as Hedging Instrument [Member] | Energy Related Derivative | Fair Value of Derivatives Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 135 | 65
Designated as Hedging Instrument [Member] | Energy Related Derivative | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (45) | (53)
Designated as Hedging Instrument [Member] | Energy Related Derivative | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 64 | 14
Designated as Hedging Instrument [Member] | Energy Related Derivative | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 0 | (24)
Designated as Hedging Instrument [Member] | Interest rate contract |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 133 | 205
Liability derivatives | (115) | (65)
Designated as Hedging Instrument [Member] | Interest rate contract | Fair Value of Derivatives Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 12 | 41
Designated as Hedging Instrument [Member] | Interest rate contract | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (37) | (3)
Designated as Hedging Instrument [Member] | Interest rate contract | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 121 | 164
Designated as Hedging Instrument [Member] | Interest rate contract | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (78) | (62)
Designated as Hedging Instrument [Member] | Currency Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 197 | 166
Liability derivatives | (6) | (6)
Designated as Hedging Instrument [Member] | Currency Swap [Member] | Fair Value of Derivatives Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 91 | 0
Designated as Hedging Instrument [Member] | Currency Swap [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (6) | (6)
Designated as Hedging Instrument [Member] | Currency Swap [Member] | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 106 | 166
Designated as Hedging Instrument [Member] | Currency Swap [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 0 | 0
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Fair Value of Derivatives Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 22 | 8
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (5) | (22)
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 0 | 0
Not Designated as Hedging Instrument [Member] | Energy Related Derivative | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 0 | (2)
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 22 | 8
Liability derivatives | $ (5) | $ (24)

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