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Debt Debt Fair Value Adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Amortization Period of Deferred Gain (Loss) on Discontinuation of Fair Value Hedge	16 years
Purchase accounting debt fair value adjustments	$ 719	$ 806
Carrying value adjustment to hedged debt	115	220
Unamortized portion of proceeds received from the early termination of interest rate swap agreements	297	342
Unamortized debt discounts, net	(74)	(80)
Unamortized debt issuance costs	(130)	(139)
Total debt fair value adjustments	$ 927	$ 1,149

X

- Definition

Amount the adjustment to fair value of debt was increased by related to the fair value of interest rate swaps

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Purchase accounting debt fair value adjustments

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- Definition

Period when adjustments to the carrying value of an interest-bearing hedged item are amortized upon discontinuation of the fair value hedge, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 35
-Paragraph 9
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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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