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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Acquisitions and Dispositions (Acquisitions Narrative) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
	Oct. 03, 2016	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Business Combination, Integration Related Costs		$ 31	$ 16	$ 20	$ 17	$ 34	$ 23	$ 30	$ 16	$ 84	$ 103
Asset Impairment Charges										402	282	$ 18
Net Income (Loss) Attributable to Parent		$ 464	$ 1,082	$ 500	$ 620	$ 703	$ 954	$ 686	$ 716	2,666	3,059	2,152
Piedmont Natural Gas [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 5,000
Long-term debt assumed	$ 2,000
Business Combination, Integration Related Costs										84	103	439
Asset Impairment Charges											7
Business Combination, After Tax Integration Related Costs												279
Revenues												367
Net Income (Loss) Attributable to Parent												20
Interest Rate Contract [Member] \| Piedmont Natural Gas [Member]
Business Acquisition [Line Items]
Loss on Interest Rate Derivative Instruments Not Designated as Hedging Instruments												190
Sales [Member] \| Piedmont Natural Gas [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs												10
Operating Expense [Member] \| Piedmont Natural Gas [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs											64	101
Operating Income (Loss) [Member] \| Piedmont Natural Gas [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs												46
Interest Expense [Member] \| Piedmont Natural Gas [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs												234
Other Expense [Member] \| Piedmont Natural Gas [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs												104
Other Expense [Member] \| Operating Expense [Member] \| Piedmont Natural Gas [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs												94
Other Expense [Member] \| Operating Income (Loss) [Member] \| Piedmont Natural Gas [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs												$ 10
System Integration Costs [Member] \| Piedmont Natural Gas [Member]
Business Acquisition [Line Items]
Business Combination, Integration Related Costs										$ 78	$ 71