Debt (Shelf Registration And Significant New Borrowings) (Narrative) (Details) - USD ($) $ in Billions	Jan. 31, 2020	Dec. 31, 2019	Nov. 14, 2019	Feb. 12, 2018
Debt Instrument [Line Items]
Board of Directors authorized debt issuance			$ 6.0	$ 6.0
Previous board of directors remaining debt issuance			$ 2.0
Board of Directors remaining debt issuance		$ 6.0
Subsequent Event [Member]
Debt Instrument [Line Items]
Board of Directors remaining debt issuance	$ 3.0