Too low. Guess again.
The answer: As of this year, 23. Here they are, in alpha order:
Ace, Always, Ariel, Bounty, Braun, Charmin, Crest, Dawn, Downy, Duracell, Fusion, Gain, Gillette, Head and Shoulders, Iams, Mach3, Olay, Oral B, Pampers, Pantene, Pringle, Tide, Wella.
Procter and Gamble is always looking for new ways to connect with consumers and stimulate trial of new brand and line extensions.
It has a link on its home page (see bottom line of screen capture) to direct consumers to "member" pages where they can print coupons, read about new products, and click to request a sample.
Watch for more billion dollar brands to join Procter and Gamble's portfolio during 2011. Merry marketing!