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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Date the credit facility terminates, in CCYY-MM-DD format.

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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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The cash outflow for the settlement of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, as it matures.

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

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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Long-Term Debt and Common Stock (Details) - USD ($)	9 Months Ended
Long-Term Debt and Common Stock (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Instrument [Abstract]
Dividends Payable, Amount Per Share Before Increase	$ 0.1850
Dividends Payable, Amount Per Share After Increase	$ 0.22
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	$ 0		$ 0
Average Outstanding Amount	$ 11,000,000	$ 9,000,000
Weighted average interest rate (in hundredths)	1.97%	1.39%
Senior Notes [Member]
Line of Credit Facility [Line Items]
Maturities of Senior Debt	$ 350,000,000
Debt Instrument, Interest Rate, Effective Percentage	6.875%
Uncommitted Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	$ 0		0
Revolving Credit Agreement 2020 [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	0		$ 0
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000
Line of Credit Facility, Expiration Date	Jul. 21, 2020
Eurodollar [Member] \| Revolving Credit Agreement 2020 [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate (in hundredths)	3.16%
Base Rate [Member] \| Revolving Credit Agreement 2020 [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate (in hundredths)	5.25%