Reporting RMD

2019 was the first year for my RMD. I also retired in 2019. I Had 3 retirement accounts, indywidual IRA account with Fidelity, 403(B) with fidelity and 403(B) with TIAA.  In December 2019,  I  combine required amount of RMD from my Fidelity IRA and TIAA and took it from my Fidelity IRA. I took a separate RMD from my Fidelity 403(b) account. Accordingly I received two 1099-R from Fidelity.  How should I report to IRS that one of my 1099-R refers also to RMD from TIAA?   I didn't get any statement from TIAA related to my required RMD.  I called TIAA and didn't get any clear answer except that they confirmed correct amount for RMD.

Also my understanding is that since I took my RMD in December 2019 I should report it on my 2019 tax report. Is that correct?