Adjustments to Additional Paid in Capital, Premium on Financial Instruments Subject to Mandatory Redemption

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Equity Units, Percentage Interest in Attached Debt Instrument

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Financial Instruments Subject to Mandatory Redemption, Anti-Dilution Provision, Conversion Ratio

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Financial Instruments Subject to Mandatory Redemption, Anti-Dilution Provision, Stock Price Threshold

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Financial Instruments Subject to Mandatory Redemption, Contract Adjustment Rate

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Financial Instruments Subject to Mandatory Redemption, Contract Adjustment Rate, Annual Amount

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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The per share price of the Company's stock at which the contract holder of the freestanding contract has the right to purchase or sell the Company's stock at a future date.

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Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments, excluding current portion.

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The maximum number of shares that the issuer could be required to issue to redeem the instrument, if applicable.

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The number of shares that would be issued, determined under the conditions specified in the contract, if the settlement were to occur at the reporting date.

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Long-Term Debt (Details) $ / shares in Units, shares in Millions			1 Months Ended	12 Months Ended
	Jan. 01, 2017 $ / shares	Oct. 05, 2016 USD ($)	Oct. 31, 2016 USD ($) day $ / shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2016 USD ($)	Oct. 31, 2019 shares	Dec. 31, 2017 USD ($)	Oct. 01, 2016
Debt Instrument [Line Items]
Face amount \| $				$ 1,445,000,000
Junior subordinated debentures \| $				1,145,000,000			$ 1,145,000,000
Equity units, percentage interest in attached debt instrument			0.005%
Financial instruments subject to mandatory redemption, settlement terms, share value, amount \| $					$ 98,000,000
October series C 1.5% RSNs maturing 2024 \| Other long-term debt
Debt Instrument [Line Items]
Face amount \| $		$ 675,000,000	$ 675,000,000
Interest rate		1.50%	1.50%
Unsuccessful remarketing \| October series C 1.5% RSNs maturing 2024 \| Other long-term debt
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			100.00%
Equity units subject to mandatory redemption
Debt Instrument [Line Items]
Forward contract indexed to issuer's equity, forward rate per share (in dollars per share)			$ 50
Financial instruments subject to mandatory redemption, contract adjustment rate	5.00%	5.00%
Financial instruments subject to mandatory redemption, contract adjustment rate, annual amount (in dollars per share)	$ 2.50
Financial instruments subject to mandatory redemption, settlement terms, share value, amount \| $				$ 98,000,000
Financial instruments subject to mandatory redemption, settlement terms, maximum number of shares (in shares) \| shares				9.0
Equity units subject to mandatory redemption \| Minimum \| Scenario, Forecast
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, settlement terms, number of shares (in shares) \| shares						5.8
Equity units subject to mandatory redemption \| Maximum \| Scenario, Forecast
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, settlement terms, number of shares (in shares) \| shares						7.3
Equity units subject to mandatory redemption \| Equal to or greater than $116.31, 0.4299 shares of common stock
Debt Instrument [Line Items]
Number of consecutive scheduled trading days \| day			20
Financial instruments subject to mandatory redemption, anti-dilution provision, conversion ratio			0.4299
Equity units subject to mandatory redemption \| Equal to or greater than $116.31, 0.4299 shares of common stock \| Minimum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share)			$ 116.31
Equity units subject to mandatory redemption \| Less than $116.31, but greater than $93.05, number of shares of common stock equal to $50 divided by the AMV rounded to the nearest 1/10,000th of a share \| Minimum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share)			93.05
Equity units subject to mandatory redemption \| Less than $116.31, but greater than $93.05, number of shares of common stock equal to $50 divided by the AMV rounded to the nearest 1/10,000th of a share \| Maximum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share)			$ 116.31
Equity units subject to mandatory redemption \| Less than or equal to $93.05, 0.5373 shares of common stock
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, conversion ratio			0.5373
Equity units subject to mandatory redemption \| Less than or equal to $93.05, 0.5373 shares of common stock \| Maximum
Debt Instrument [Line Items]
Financial instruments subject to mandatory redemption, anti-dilution provision, stock price threshold (in dollars per share)			$ 93.05
AGS \| M3 Midstream \| Midstream Natural Gas Assets
Debt Instrument [Line Items]
Percentage of voting interests acquired								100.00%
SGG \| Midstream Natural Gas Assets
Debt Instrument [Line Items]
Percentage of voting interests acquired				55.00%				55.00%
SGG \| M3 Midstream \| Midstream Natural Gas Assets
Debt Instrument [Line Items]
Percentage of voting interests acquired								40.00%
SGG \| Vega Energy Partners \| Midstream Natural Gas Assets
Debt Instrument [Line Items]
Percentage of voting interests acquired								15.00%