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Segment and Geographic Reporting Geographic Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 3,340 | $ 3,720 | $ 3,979 | $ 3,565 | $ 3,982 | $ 4,557 | $ 4,867 | $ 4,666 | $ 14,604 | $ 18,072 | $ 17,785
Other revenues from operations |  |  |  |  |  |  |  |  | 1,386 | 1,250 | 988
Property, plant and equipment, net | 9,535 |  |  |  | 8,812 |  |  |  | 9,535 | 8,812 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 9,672 | 13,086 | 13,171
Other revenues from operations |  |  |  |  |  |  |  |  | 1,304 | 1,169 | 937
Property, plant and equipment, net | 7,221 |  |  |  | 6,760 |  |  |  | 7,221 | 6,760 |
Geographic information, Germany [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,480 | 1,507 | 1,339
Other revenues from operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Property, plant and equipment, net | 464 |  |  |  | 423 |  |  |  | 464 | 423 |
Geographic information, Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 3,452 | 3,479 | 3,275
Other revenues from operations |  |  |  |  |  |  |  |  | 82 | 81 | $ 51
Property, plant and equipment, net | $ 1,850 |  |  |  | $ 1,629 |  |  |  | $ 1,850 | $ 1,629 |

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