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Condensed Consolidated Statements of Shareholders' Equity (Parentheticals) - USD ($) shares in Millions, $ in Millions | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Treasury shares held in trust (in shares) |  | 1 | 1 | 1 |  | 1
Treasury shares held in trust value |  | $ 29 | $ 29 | $ 29 |  | $ 29
Common stock par value |  | $ 17 | $ 17 | $ 17 |  | $ 17
Accounting Standards Update 2016-02 |  |  |  |  |  |
Adoption of new accounting standard | [1] |  |  |  | $ 178 |
Retained Earnings | Accounting Standards Update 2016-02 |  |  |  |  |  |
Adoption of new accounting standard | [1] |  |  |  | $ 178 |
[1] | Reflects the adoption of Accounting Standards Update (“ASU”) 2016-02, Leases (Topic 842), which resulted in an increase to retained earnings of $178 million during the three months ended March 31, 2019.

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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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