  A combination of the results of several searches for the electroweak
production of the supersymmetric partners of standard model bosons, and of
charged leptons, is presented. All searches use proton-proton collision data at
$\sqrt{s}$ = 13 TeV recorded with the CMS detector at the LHC in 2016-2018. The
analyzed data correspond to an integrated luminosity of up to 137 fb$^{-1}$.
The results are interpreted in terms of simplified models of supersymmetry. Two
new interpretations are added with this combination: a model spectrum with the
bino as the lightest supersymmetric particle together with mass-degenerate
higgsinos decaying to the bino and a standard model boson, and the
compressed-spectrum region of a previously studied model of slepton pair
production. Improved analysis techniques are employed to optimize sensitivity
for the compressed spectra in the wino and slepton pair production models. The
results are consistent with expectations from the standard model. The
combination provides a more comprehensive coverage of the model parameter space
than the individual searches, extending the exclusion by up to 125 GeV, and
also targets some of the intermediate gaps in the mass coverage.
