2.2.0.25falsefalse128 - Disclosure - Share-Based Compensation (Detail)truefalseIn Millionsfalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011
USD ($)
USD ($) / shares
$eol_PE1341----1110-Q0005_STD_90_20110331_0http://www.sec.gov/CIK0000080424duration2011-01-01T00:00:002011-03-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares0USDUSD$2falsefalseUSDfalsefalse1/1/2010 - 3/31/2010
USD ($)
USD ($) / shares
$eol_PE1341----1110-Q0005_STD_90_20100331_0http://www.sec.gov/CIK0000080424duration2010-01-01T00:00:002010-03-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares0USDUSD$3falsefalseUSDfalsefalse7/1/2010 - 3/31/2011
USD ($)
USD ($) / shares
$eol_PE1341----1110-Q0005_STD_274_20110331_0http://www.sec.gov/CIK0000080424duration2010-07-01T00:00:002011-03-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares0USDUSD$4falsefalseUSDfalsefalse7/1/2009 - 3/31/2010
USD ($)
USD ($) / shares
$eol_PE1341----1110-Q0005_STD_274_20100331_0http://www.sec.gov/CIK0000080424duration2009-07-01T00:00:002010-03-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170iso4217_USD_per_sharesDividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instanceshares0sharesStandardhttp://www.xbrl.org/2003/instanceshares0USDUSD$5true0us-gaap_ShareBasedCompensationAbstractus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsefalsefalse4falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalse6false0us-gaap_StockOptionPlanExpenseus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse101000000101falsetruefalsefalsefalse2truefalsefalse116000000116falsetruefalsefalsefalse3truefalsefalse254000000254falsetruefalsefalsefalse4truefalsefalse307000000307falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe noncash expense that accounts for the value of stock options distributed to employees as compensation.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64
Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph i
falsefalse7false0pg_OtherStockBasedCompensationExpensepgfalsedebitdurationOther stock based compensation expense (including the amortization of restricted stock units).falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse1400000014falsefalsefalsefalsefalse2truefalsefalse1200000012falsefalsefalsefalsefalse3truefalsefalse4100000041falsefalsefalsefalsefalse4truefalsefalse2600000026falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryOther stock based compensation expense (including the amortization of restricted stock units).No authoritative reference available.falsefalse8false0us-gaap_ShareBasedCompensationus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse115000000115falsetruefalsefalsefalse2truefalsefalse128000000128falsetruefalsefalsefalse3truefalsefalse295000000295falsetruefalsefalsefalse4truefalsefalse333000000333falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
truefalse44Share-Based Compensation (Detail) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue
