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Segment Information (Schedule Of Operating Results Of Reportable Segments) (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Third-party sales | $ 6,350 | $ 5,223 | $ 18,805 | $ 15,179
Intersegment sales | 1,597 | 1,141 | 4,845 | 3,664
Total sales | 7,947 | 6,364 | 23,650 | 18,843
Equity income (loss) | (2) | 2 | 24 | 10
Depreciation, depletion, and amortization | 355 | 336 | 1,050 | 1,019
Income taxes | 156 | 64 | 570 | 275
After-tax operating income (ATOI) | 462 | 328 | 1,652 | 1,015
Alumina [Member] |  |  |  |
Third-party sales | 879 | 717 | 2,615 | 2,056
Intersegment sales | 751 | 506 | 2,107 | 1,627
Total sales | 1,630 | 1,223 | 4,722 | 3,683
Equity income (loss) | 2 | 1 | 27 | 7
Depreciation, depletion, and amortization | 117 | 100 | 332 | 299
Income taxes | 42 | (22) | 146 | 46
After-tax operating income (ATOI) | 154 | 70 | 482 | 236
Primary Metals [Member] |  |  |  |
Third-party sales | 2,124 | 1,688 | 6,249 | 5,100
Intersegment sales | 798 | 589 | 2,559 | 1,905
Total sales | 2,922 | 2,277 | 8,808 | 7,005
Equity income (loss) | (4) |  | (4) | 1
Depreciation, depletion, and amortization | 137 | 142 | 420 | 431
Income taxes | 21 | (3) | 129 | 15
After-tax operating income (ATOI) | 110 | 78 | 513 | 310
Flat-Rolled Products [Member] |  |  |  |
Third-party sales | 1,974 | 1,645 | 5,951 | 4,654
Intersegment sales | 48 | 46 | 179 | 132
Total sales | 2,022 | 1,691 | 6,130 | 4,786
Depreciation, depletion, and amortization | 61 | 57 | 179 | 173
Income taxes | 26 | 26 | 94 | 72
After-tax operating income (ATOI) | 60 | 66 | 240 | 167
Engineered Products and Solutions [Member] |  |  |  |
Third-party sales | 1,373 | 1,173 | 3,990 | 3,369
Total sales | 1,373 | 1,173 | 3,990 | 3,369
Equity income (loss) |  | 1 | 1 | 2
Depreciation, depletion, and amortization | 40 | 37 | 119 | 116
Income taxes | 67 | 63 | 201 | 142
After-tax operating income (ATOI) | $ 138 | $ 114 | $ 417 | $ 302

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