Going by order of release:
Iron Man - 585,174,222
The Incredible Hulk - 263,427,551
Iron Man 2 - 623,933,331
Thor - 449,326,618
Captain America TFA - 370,569,774
The Avengers - 1,518,812,988
*The Avengers put Marvel over the top with $3,811,244,484
Iron Man 3 - 1,214,811,252
Thor The Dark World - 644,571,402
Captain America TWS - 714,264,267
Guardians of the Galaxy - 773,328,629
Avengers AOU - 1,405,403,694
Ant-Man - 519,311,965
Civil War - 1,153,304,495
Doctor Strange - 677,718,395
Guardians of the Galaxy vol 2 - 856,461,129
Grand total of $11,770,419,712 after 15 movies.