Post 2015 World Cup
ODI
Kohli 3051 @ 80.28 SR 97.78 (Away 1562 @ 91.88 SR 99.61)
Root 2649 @ 63.07 SR 91.88 (Away 1150 @ 70.56 SR 86.77)
Williamson 2470 @ 49.40 SR 84.21 (Away 1150 @ 52.27 SR 88.05)
Smith 1882 @ 42.77 SR 84.01 (Away 859 @ 33.03 SR 75.41)
Kohli Root and Williamson are also #1,2,3, Smith #13 for most runs scored of all players in this period.
T20I
Kohli 1011 @ 56.16 SR 143.20 (Away 395 @ 65.83 SR 149.05)
Williamson 876 @ 33.69 SR 121.83 (Away 208 @ 23.11 SR 124.55)
Root 560 @ 40 SR 129.62 (Away 168 @ 42 SR 112)
Smith 263 @ 32.87 SR 135.56 (Away 161 @ 32.20 SR 137.60)
Kohli #3, Williamson #6, Root #24, Smith #90 for most runs scored of all players in this period
Tests
Root 4020 @ 53.60 (Away 1762 @ 50.34)
Smith 3895 @ 68.33 (Away 2060 @ 57.22)
Kohli 3007 @ 61.36 (Away 945 @ 47.25)
Williamson 2282 @ 60.05 (Away 1084 @ 63.76)
Root #1, Smith #2, Kohli #5 and Williamson #11 for most runs scored of all players in this period
Arbitrary all Test/ODI/T20I
Away
Smith 3080 @ 45.97
Root 3059 @ 55.61
Kohli 2902 @ 67.48
Williamson 2442 @ 50.87
#1, 2, 3 and 5 of all players respectively (Warner 4th at 2787 @ 38.70)
Home/Away/Neutral
Root 7229 @ 55.18
Kohli 7069 @ 67.32
Smith 6040 @ 55.41
Williamson 5628 @ 49.36
#1, 2, 3 and 5 of all players respectively (Warner 4th @ 5874 @ 46.61)