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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)

X

- Definition

Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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