| **Debt (Details) - USD ($)**                                                                                               |                 | 3 Months Ended  | 12 Months Ended |               |
|----------------------------------------------------------------------------------------------------------------------------|-----------------|-----------------|-----------------|---------------|
||
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 7,979,000,000 | $ 7,976,000,000 |          |
| Unamortized Discount                                                                                                       |            | (24,000,000)    | (24,000,000)    |          |
| Debt Instrument, Unamortized Premium                                                                                       |            | 19,000,000      | 113,000,000     |          |
| Total Debt, Net of Discount                                                                                                |            | 7,936,000,000   | 8,029,000,000   |          |
| Capital Lease Obligations, Current                                                                                         |            | (54,000,000)    | (53,000,000)    |          |
| Long-term Debt Due After One Year                                                                                          |            | $ 7,882,000,000 | 7,976,000,000   |          |
| Term Loan Facility [Member]                                                                                                |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       | $ 1,400,000,000 |            | $ 0             |          |
| Debt stated rate                                                                                                           |            |            | 0.00%           |          |
| Debt instrument, maturity date                                                                                             |            | Jan.  06,  2019 |            |          |
| Revolving Credit Facility, due August 27, 2020                                                                             |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 0             | $ 0             |          |
| Debt stated rate                                                                                                           |            | 0.00%           | 0.00%           |          |
| Debt instrument, maturity date                                                                                             |            | Aug. 27,  2020  | Aug. 27,  2020  |          |
| Revolving Credit Facility Maximum Borrowing Capacity                                                                       |            | $ 4,000,000,000 |            |          |
| Credit facility fee rate basis points, minimum                                                                             |            |            |            | 0.10%         |
| Credit facility fee rate basis points, maximum                                                                             |            |            |            | 0.25%         |
| Credit facility aggregate short-term loans and letters of credit, maximum                                                  |            |            |            | $ 500,000,000 |
| Credit facility aggregate short-term loans and letters of credit, committed                                                |            | 450,000,000     |            |          |
| Credit facility interest rate, Eurodollar rate plus, minimum                                                               |            |            |            | 0.90%         |
| Credit facility interest rate, Eurodollar rate plus, maximum                                                               |            |            |            | 1.50%         |
| Capital Lease and Other Obligations                                                                                        |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 390,000,000   | $ 403,000,000   |          |
| Debt stated rate                                                                                                           |            | 0.00%           | 0.00%           |          |
| Capital Lease Obligations, Current                                                                                         |            | $ (54,000,000)  | $ (53,000,000)  |          |
| 8.25% Senior Notes, due March 1, 2019                                                                                      |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 1,000,000,000 | $ 1,000,000,000 |          |
| Debt stated rate                                                                                                           |            | 8.25%           | 8.25%           |          |
| Debt instrument, maturity date                                                                                             |            | Mar.  01,  2019 | Mar.  01,  2019 |          |
| 5.625% Senior Notes, due May 1, 2021                                                                                       |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 379,000,000   | $ 693,000,000   |          |
| Debt stated rate                                                                                                           |            | 5.625%          | 5.625%          |          |
| Debt instrument, maturity date                                                                                             |            | May  01,  2021  | May  01,  2021  |          |
| 4.15% Senior Notes, due December 15, 2021                                                                                  |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 1,000,000,000 | $ 1,000,000,000 |          |
| Debt stated rate                                                                                                           |            | 4.15%           | 4.15%           |          |
| Debt instrument, maturity date                                                                                             |            | Dec. 15,  2021  | Dec. 15,  2021  |          |
| 5.875% Senior Notes, due June 1, 2022                                                                                      |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 18,000,000    | $ 597,000,000   |          |
| Debt stated rate                                                                                                           |            | 5.875%          | 5.875%          |          |
| Debt instrument, maturity date                                                                                             |            | Jun.  01,  2022 | Jun.  01,  2022 |          |
| 7.25% Senior Notes, due October 15, 2023                                                                                   |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 100,000,000   | $ 100,000,000   |          |
| Debt stated rate                                                                                                           |            | 7.25%           | 7.25%           |          |
| Debt instrument, maturity date                                                                                             |            | Oct. 15,  2023  | Oct. 15,  2023  |          |
| Unamortized Debt Issuance Expense                                                                                          |            | $ (38,000,000)  | $ (36,000,000)  |          |
| 5.875% Senior Notes, due June 1, 2024                                                                                      |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 8,000,000     | $ 499,000,000   |          |
| Debt stated rate                                                                                                           |            | 5.875%          | 5.875%          |          |
| Debt instrument, maturity date                                                                                             |            | Jun.  01,  2024 | Jun.  01,  2024 |          |
| 3.90% Senior Notes, due November 15, 2024                                                                                  |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 650,000,000   | $ 650,000,000   |          |
| Debt stated rate                                                                                                           |            | 3.90%           | 3.90%           |          |
| Debt instrument, maturity date                                                                                             |            | Nov. 15,  2024  | Nov. 15,  2024  |          |
| 8.00% Senior Notes, due April 1, 2027                                                                                      |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 250,000,000   | $ 250,000,000   |          |
| Debt stated rate                                                                                                           |            | 8.00%           | 8.00%           |          |
| Debt instrument, maturity date                                                                                             |            | Apr.  01,  2027 | Apr.  01,  2027 |          |
| 6.00% Senior Notes, due March 1, 2041                                                                                      |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 850,000,000   | $ 850,000,000   |          |
| Debt stated rate                                                                                                           |            | 6.00%           | 6.00%           |          |
| Debt instrument, maturity date                                                                                             |            | Mar.  01,  2041 | Mar.  01,  2041 |          |
| 5.25% Senior Notes, due November 15, 2043                                                                                  |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 1,000,000,000 | $ 1,000,000,000 |          |
| Debt stated rate                                                                                                           |            | 5.25%           | 5.25%           |          |
| Debt instrument, maturity date                                                                                             |            | Nov. 15,  2043  | Nov. 15,  2043  |          |
| 5.05% Senior Notes, due November 15, 2044                                                                                  |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 850,000,000   | $ 850,000,000   |          |
| Debt stated rate                                                                                                           |            | 5.05%           | 5.05%           |          |
| Debt instrument, maturity date                                                                                             |            | Nov. 15,  2044  | Nov. 15,  2044  |          |
| 7.25% Senior Debentures, due August 1, 2097                                                                                |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt                                                                                                                       |            | $ 84,000,000    | $ 84,000,000    |          |
| Debt stated rate                                                                                                           |            | 7.25%           | 7.25%           |          |
| Debt instrument, maturity date                                                                                             |            | Aug.  01,  2097 | Aug.  01,  2097 |          |
| Revolving Credit Facility, due August 27, 2020 | Credit Facility [Member]                                                  |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Proceeds from Lines of Credit                                                                                              |            | $ 1,380,000,000 |            |          |
| Debt stated rate                                                                                                           |            | 1.69%           |            |          |
| Credit facility fee rate basis points, minimum                                                                             | 0.10%           |            |            |          |
| Credit facility fee rate basis points, maximum                                                                             | 0.75%           |            |            |          |
| Debt Instrument, Term                                                                                                      | 3 years         |            |            |          |
| Revolving Credit Facility, due August 27, 2020 | Federal Funds Effective Swap Rate [Member] | Credit Facility [Member]     |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Debt instrument, variable rate                                                                                             | 0.50%           |            |            |          |
| Revolving Credit Facility, due August 27, 2020 | London Interbank Offered Rate (LIBOR) [Member] | Credit Facility [Member] |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Credit facility interest rate, Eurodollar rate plus, minimum                                                               | 1.00%           |            |            |          |
| Credit facility interest rate, Eurodollar rate plus, maximum                                                               | 1.75%           |            |            |          |
| Debt instrument, variable rate                                                                                             | 1.00%           |            |            |          |
| Other Operating Income (Expense) [Member] | Revolving Credit Facility, due August 27, 2020 | Credit Facility [Member]      |            |            |            |          |
| **Debt Instrument [Line Items]**                                                                                           |            |            |            |          |
| Gain on tendered offers                                                                                                    |            | $ 80,000,000    |            |          |

| X                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Maximum incremental aggregate short-term loans and letters of credit capacity under the terms of a credit facility.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                  |
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Amount of the fee for available but unused credit capacity under the credit facility, maximum
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| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Amount of the fee for available but unused credit capacity under the credit facility, minimum
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Adjustment maximum made to the stated Eurodollar rate to determine the effective rate.
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Adjustment minimum made to the stated Eurodollar rate to determine the effective rate.
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Credit facility aggregate short-term loans and letters of credit, committed
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No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of capital lease obligation due within one year or the normal operating cycle, if longer.
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| X                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage points added to the reference rate to compute the variable rate on the debt instrument.
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Contractual interest rate for funds borrowed, under the debt agreement.
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| - Definition
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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No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.
+ References
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| - Definition
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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No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after accumulated amortization, of debt discount.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after accumulated amortization, of debt premium.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
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| X                                                                                                                                             |
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| X                                                                                                                                             |
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