Condensed Consolidated Statements of Shareholders' Equity (Parentheticals) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Treasury Shares Held in Trust (in shares)	1	1	1	1	1	1
Treasury shares held in trust value	$ 29	$ 29	$ 29	$ 31	$ 31	$ 31
Common stock par value	$ 17	$ 17	$ 17	17	$ 17	$ 17
Accounting Standards Update 2014-09
Adoption of new accounting standard				13
Accounting Standards Update 2018-02
Adoption of new accounting standard				$ 7