In the present work, we show that p-type double doping as a two-fold integer charge transfer process from two conjugated polymer chains onto a single dopant molecule, can be described by ground state broken symmetry DFT calculations. The double doping in the CN6-CP:bithiophene-thienothiophene complex studied is manifested by the formation of a CN6-CP di-anion and two individual positively charged polarons on the conjugated chains, respectively. Also in the presence of the CN6-CP di-anion, the main features of the vibrational IR spectrum of the molecular complex can be identified as the vibrational modes coupled to the two individual polarons. With the doping-induced formation of in-gap polaron states, the optical absorption spectrum of the complex shows signatures of both polaron intraband excitations (P2 polaron peaks) and polaron interband excitation (P1 polaron peaks) occurring on each of the pdoped conjugated chains. Furthermore, inter-molecular charge transfer excitations with low oscillator strength are also found for the closely packed molecular complex.