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Aggregate dividends declared during the period for each share of common stock outstanding

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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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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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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Maximum amount borrowed under the credit facility at any time during the period.

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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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Weighted average interest rate of short-term debt outstanding calculated over time.

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Long-Term Debt and Common Stock (Details) - USD ($)	3 Months Ended	6 Months Ended		12 Months Ended
Long-Term Debt and Common Stock (Details) - USD ($)	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Debt Instrument [Abstract]
Debt Instrument, Face Amount	$ 900,000,000	$ 900,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.625%	5.625%
Dividends Common Stock Declared Per Share	$ 0.22
Dividends Payable, Amount Per Share After Increase	$ 0.2875
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding		$ 0
Average Borrowings Outstanding		17,000,000
Weighted average interest rate (in hundredths)			1.97%
Uncommitted Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding				$ 0
Revolving Credit Agreement (New Facility) [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding		0
Letters of Credit Outstanding	$ 0	0
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000.0	$ 2,000,000,000.0
Line of Credit Facility, Expiration Date		Jun. 27, 2024
Line Of Credit Facility Increase Additional Borrowings		$ 3,000,000,000.0
Maximum Total Debt To Total Capitalization Ratio Allowed Under Financial Covenant	65.00%	65.00%
Revolving Credit Agreement 2020 [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding		$ 0		0
Letters of Credit Outstanding	$ 0	0		$ 0
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000.0	$ 2,000,000,000.0
Line of Credit Facility, Expiration Date		Jul. 21, 2020
Eurodollar [Member] \| Revolving Credit Agreement (New Facility) [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate (in hundredths)		3.30%
Base Rate [Member] \| Revolving Credit Agreement (New Facility) [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate (in hundredths)		5.50%