I ran across a figure of 22.45 billion barrels of US reserves, a figure which doesn't include:
10 billion in ANWR.
86 billion in the outer continental shelf.
24 billion in the Bakken formation in Montana and North Dakota (most recent estimates are 18 to 24 billion recoverable, with 167 billion barrels in total.
800 billion barrels worth of shale oil.

US + ANWR is 32.45 billion (2.35% of world).
US + ANWR + Outer Continental Shelf is 118.45 billion barrels (8.07% of world).
US + ANWR + Outer Continental Shelf + Bakken (24 B) is 142.45 billion barrels (9.6% of world).
US + ANWR + Outer Continental Shelf + Bakken + Shale oil is 942.45 billion barrels (41.1% of world).
Toss in Canada (178.9 billion barrels) and you get 1.121 trillion barrels (49% of world).

All my percentages of world reserves reflect that addition of these new sources to the world's total, as that final figure would be 83%, as if our new fields were drawing down from the starting world total of 1.349 trillion barrels.

But what do you expect from an administration that thinks the Ai...r Force is flying nuclear reactor coolant to Japan, as if they don't have water there?