Financing Activities - Equity Securities (Details) - USD ($) $ in Billions	3 Months Ended
Mar. 31, 2020	Feb. 28, 2018
Other Liabilities Disclosure [Abstract]
Common Stock Aggregate Sales Price		$ 1.0
Maximum Percentage Paid To Selling Agents	2.00%
Common stock issued	0

Number of new stock issued during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Subparagraph (SX 210.3-04)
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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Period Type:	duration