T2K and NOvA are two currently active long-baseline neutrino oscillation experiments studying $\nu_\mu/\bar{\nu}_\mu$ disappearance and $\nu_e/\bar{\nu}_e$ appearance in $\nu_\mu/\bar{\nu}_\mu$ accelerator neutrino beams. This report presents a joint T2K+NOvA neutrino oscillation analysis within the standard three active neutrino flavors paradigm, which includes each experiment's fully detailed detector simulations and takes advantage of the experiments' complementary oscillation baselines of 295 km and 810 km and neutrino energies around 0.6 GeV and 2 GeV for T2K and NOvA, respectively. The combination of the differing sensitivities to neutrino oscillation and the T2K+NOvA data could constrain the oscillation parameters better than either experiment alone. We discuss the general joint analysis strategy within a unified Bayesian framework and provide an overview of the robustness checks and tests performed.