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Shareholders' Equity (Reclassification out of AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Gain on consolidation of Aspire subcontracting entities                 $ 0 $ 108 $ 0
Tax benefit                 59 86 (193)
Net pension and post-retirement benefits                 (16) (39)  
Other non-operating income (loss)                 5 (6) 4
Net income $ 59 $ 58 $ 50 $ 42 $ 53 $ 56 $ 64 $ 137 209 310 $ 440
Accumulated foreign currency adjustments                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net pension and post-retirement benefits                 8 (6)  
Changes in fair value for derivatives                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net pension and post-retirement benefits                 (10)    
Changes in fair value of derivatives                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net pension and post-retirement benefits                   (9)  
Reclassification out of Accumulated Other Comprehensive Income | Accumulated foreign currency adjustments                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Gain on consolidation of Aspire subcontracting entities                 8 (6)  
Tax benefit                 0 0  
Net income                 8 (6)  
Reclassification out of Accumulated Other Comprehensive Income | Accumulated pension liability adjustments                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Amortization of actuarial loss                 (17) (28)  
Tax benefit                 3 4  
Net pension and post-retirement benefits                 (14) (24)  
Reclassification out of Accumulated Other Comprehensive Income | Changes in fair value for derivatives                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Tax benefit                 0    
Other non-operating income (loss)                 (10)    
Net income                 $ (10)    
Reclassification out of Accumulated Other Comprehensive Income | Changes in fair value of derivatives                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Tax benefit                   0  
Other non-operating income (loss)                   (9)  
Net income                   $ (9)