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Financing Activities Financing Activities- Equity Securities (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 28, 2018
Equity Programs [Line Items] |  |  |  |  |
Issuance of common stock |  | $ 34 | $ 1,167 | $ 698 |
Common Stock [Member] |  |  |  |  |
Equity Programs [Line Items] |  |  |  |  |
Common stock shares issued | [1] | 1,674 | 46,910 | 26,925 |
At The Market Stock Offering Program [Member] |  |  |  |  |
Equity Programs [Line Items] |  |  |  |  |
Common Stock Aggregate Sales Price |  |  |  |  | $ 1,000
Maximum Percentage Paid To Selling Agents |  | 2.00% |  |  |
Common stock shares issued |  | 0 |  |  |
[1] | Shares in thousands. Each share entitles the holder to one vote on any question presented at any shareowners' meeting.

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