Long-Term Debt and Common Stock (Details) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Abstract]
Proceeds from Debt, Net of Issuance Costs	$ 1,480,000,000
Dividends Common Stock Declared Per Share	$ 0.2875
Dividends Payable, Amount Per Share After Increase	$ 0.375
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	$ 0	$ 0
Revolving Credit Agreement (New Facility) [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 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%
Revolving Credit Agreement 2020 [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	$ 0	$ 0
Eurodollar [Member] \| Revolving Credit Agreement (New Facility) [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate (in hundredths)	1.06%
Base Rate [Member] \| Revolving Credit Agreement (New Facility) [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate (in hundredths)	3.25%
4.40% Senior Notes Due 2020 [Member]
Debt Instrument [Abstract]
Debt Instrument, Face Amount	$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.40%
4.100% Senior Notes Due 2021 [Member]
Debt Instrument [Abstract]
Debt Instrument, Face Amount	$ 750,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.10%
2.45% Senior Notes Due 2020 [Member]
Debt Instrument [Abstract]
Debt Instrument, Face Amount	$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage	2.45%
4.375% Senior Notes Due 2030 [Member]
Debt Instrument [Abstract]
Debt Instrument, Face Amount	$ 750,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.375%
4.950% Senior Notes Due 2050 [Member]
Debt Instrument [Abstract]
Debt Instrument, Face Amount	$ 750,000,000
Debt Instrument, Interest Rate, Stated Percentage	4.95%

No definition available.

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- Definition

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

+ References

No definition available.

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The per share amount of a dividend declared, but not paid.

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- Definition

Line Of Credit Facility Increase Additional Borrowings

+ References

No definition available.

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- Definition

Amount specified in the debt agreement of the maximum debt-to-total capitalization level which the entity is allowed to reach without impacting the entity's ability to borrow under the agreement.

+ References

No definition available.

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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- Definition

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

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- Definition

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

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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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- Definition

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

+ 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

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

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-Publisher FASB
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- Definition

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

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No definition available.

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