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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Debt Redemptions/Repayments (Details) - USD ($)			3 Months Ended		9 Months Ended		37 Months Ended
		May 02, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019	May 17, 2019	Mar. 22, 2019	Dec. 11, 2018	Jul. 01, 2018	Mar. 22, 2016
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount Offered										$ 6,200,000,000
Debt Securities, Retired										$ 4,400,000,000
Long-term Debt, Make Whole Notes									$ 1,530,000,000
Line of Credit Facility, Maximum Borrowing Capacity			$ 7,300,000,000		$ 7,300,000,000
Repayments of Long-term Debt, including breakage fees and all applicable accrued and unpaid interest		$ 4,600,000,000
Loss on early extinguishment of debt			$ 0	$ 0	$ (13,000,000)	$ 0
Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Long-term Transition Bond											$ 1,250,000,000
Debt Instrument, Interest Rate, Stated Percentage											6.00%
Senior Note 2.20 Percent Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								2.20%
Debt Instrument, Face Amount								$ 1,250,000,000
4.625% Notes due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									4.625%
Long-term Debt, Make Whole Notes									$ 474,000,000
3.625% Notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									3.625%
Long-term Debt, Make Whole Notes									$ 296,000,000
4.250% Notes due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									4.25%
Long-term Debt, Make Whole Notes									$ 163,000,000
2.800% Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									2.80%
Long-term Debt, Make Whole Notes									$ 381,000,000
6.500% Debentures due 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									6.50%
Long-term Debt, Make Whole Notes									$ 57,000,000
5.600% Senior Notes due 2036 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									5.60%
Long-term Debt, Make Whole Notes									$ 42,000,000
4.900% Notes due 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									4.90%
Long-term Debt, Make Whole Notes									$ 48,000,000
4.150% Notes due 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									4.15%
Long-term Debt, Make Whole Notes									$ 69,000,000
Senior Note Floating Rate Due 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount								750,000,000
SMR notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount Offered								$ 2,000,000,000.0
Term Loan Facility due 2020 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]											$ 4,500,000,000
Line of Credit Facility, Number of Borrowings	[1]											7
Long-term Line of Credit	[1]	$ 3,000,000,000
Debt Instrument, Term	[1]						3 years
EID [Member] | Term Loan Facility due 2020 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]											$ 4,500,000,000
[1] The Term Loan Facility was amended in 2018 to extend the maturity date to June 2020 and, subsequently, the facility was repaid and terminated in May 2019.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Fair value amount of debt instrument that was repurchased.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of investment in debt security measured at amortized cost (held-to-maturity), investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Long-Term transition bonds are bonds under the Competition Act in which the proceeds of Transition Bonds are required to be used principally to reduce qualified stranded costs and the related capitalization of the utility. This represents the current and noncurrent portions. The initial maturity is beyond one year or beyond the normal operating cycle, if longer.

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