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Financing Activities - Equity Securities (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
May 31, 2018 counterparties shares | Jun. 30, 2018 USD ($) shares | Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) shares | Feb. 28, 2018 USD ($)
Equity Programs [Line Items] |  |  |  |  |  |
Issuance of common stock | $ |  |  |  | $ 147 | $ 177 |
Common Stock [Member] |  |  |  |  |  |
Equity Programs [Line Items] |  |  |  |  |  |
Common stock shares issued | [1] |  |  | 5,730,000 | 5,742,000 |
Forward Sale Agreement [Member] | Common Stock [Member] |  |  |  |  |  |
Equity Programs [Line Items] |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  | 55,000,000 |  |  |  |
Number of Counterparties | counterparties |  | 2 |  |  |  |
Total Number Of Shares Issued In Forward Sales Agreements And Overallotment Option |  | 63,250,000.00 |  |  |  |
Sale of Stock, Price Per Share | $ / shares |  |  |  | $ 26.7057 |  |
Over-Allotment Option [Member] | Forward Sale Agreement [Member] | Common Stock [Member] |  |  |  |  |  |
Equity Programs [Line Items] |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  | 8,250,000.00 |  |  |  |
Maximum [Member] | Forward Sale Agreement [Member] | Common Stock [Member] |  |  |  |  |  |
Equity Programs [Line Items] |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Date |  | Nov. 30, 2019 |  |  |  |
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 |  |  | 1,200,000 | 4,200,000 |  |
Issuance of common stock | $ |  |  | $ 34 | $ 119 |  |
[1] | Shares in thousands. Each share entitles the holder to one vote on any question presented at any shareowners' meeting.

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