Joint accounts. And I leave the details to Snowbunny; she is "the family organizer."
I wouldn't say we have committed to anything on paper (other than things like apartment leases). Our commitment ceremony involved vocal promises only. Nothing was signed.
We have a pretty good trust level and feel very confident that we'll stick together for life. Other than that it's just questions about retirement and places to move (in Washington). Again I leave decisions like that to Snowbunny, merely answering her occasional questions for me. Brother-Husband participates in the group decisions to a certain extent.
We do of course have things like power of attorney drawn up and signed for each other.
Love means never having to say, "Put down that meat cleaver!"