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Includes production and non-production related depreciation.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 falsefalseDepreciation expense4false0us-gaap_AmortizationOfIntangibleAssetsus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse4600000046falsefalsefalsefalsefalse2truefalsefalse3800000038falsefalsefalsefalsefalse3truefalsefalse9800000098falsefalsefalsefalsefalse4truefalsefalse7700000077falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) falsefalseIntangible asset amortization5false0wag_InternallyDevelopedSoftwareAmortizationwagfalsedebitdurationFor each income statement presented, the amount charged to expense for amortization of internally developed software costs.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse1000000010falsefalsefalsefalsefalse2truefalsefalse1200000012falsefalsefalsefalsefalse3truefalsefalse2300000023falsefalsefalsefalsefalse4truefalsefalse2300000023falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryFor each income statement presented, the amount charged to expense for amortization of internally developed software costs.No authoritative reference available.falsefalseSystem development costs amortization6false0us-gaap_DepreciationDepletionAndAmortizationus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalsetotallabel1truefalsefalse256000000256falsetruefalsefalsefalse2truefalsefalse248000000248falsetruefalsefalsefalse3truefalsefalse529000000529falsetruefalsefalsefalse4truefalsefalse505000000505falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.No authoritative reference available.truefalseTotal depreciation and amortization expense45Depreciation and Amortization (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue