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Business Segment Information (Schedule Of Selected 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
Segment Reporting Information [Line Items]                      
Revenue $ 1,080 $ 1,199 $ 1,381 $ 1,436 $ 1,417 $ 1,657 $ 1,659 $ 1,633 $ 5,096 $ 6,366 $ 7,214
Total Long-Lived Assets (PP&E) 169       247       169 247  
UNITED STATES                      
Segment Reporting Information [Line Items]                      
Revenue                 2,212 2,324 2,470
Total Long-Lived Assets (PP&E) 73       115       73 115  
AUSTRALIA                      
Segment Reporting Information [Line Items]                      
Revenue                 836 1,380 1,768
Africa [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 164 251 593
Middle East [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 786 707 913
Europe [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 495 624 575
CANADA                      
Segment Reporting Information [Line Items]                      
Revenue                 185 752 687
Latin America [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 131 111 74
UNITED KINGDOM                      
Segment Reporting Information [Line Items]                      
Total Long-Lived Assets (PP&E) 48       68       48 68  
Other [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 287 217 $ 134
Total Long-Lived Assets (PP&E) $ 48       $ 64       $ 48 $ 64