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Accumulated Other Comprehensive Income/(Loss) (Components Of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Accumulated Other Comprehensive (Loss)/Income, Net of Tax        
Effect of adoption of new accounting principle       $ (17)
Beginning Balance, value $ (569) $ 774 $ 633  
Other comprehensive income/(loss) 0 (33) 96  
Ending Balance, value (524) (569) 774  
Foreign Currency Translation Adjustments        
Accumulated Other Comprehensive (Loss)/Income, Net of Tax        
Beginning balance, Pretax (147) (96) (217)  
Period change, Pretax (1) (75) 121  
Pretax- Amount reclassed to earnings 0 24    
Ending balance, Pretax (148) (147) (96)  
Beginning balance, Tax 94 89 115  
Period change, tax 1 13 (26)  
Amount reclassified to earnings 0 0    
Effect of adoption of new accounting principle [1]   (8)    
Ending balance, Tax 95 94 89  
Beginning Balance, value (53) (7) (102)  
Other comprehensive income/(loss)   (38) 95  
Other comprehensive (loss) before reclassifications 0 (62)    
Amount reclassified to earnings 0 24    
Ending Balance, value (53) (53) (7)  
Reclassification of tax benefit from AOCI [1]   (8)    
Unrealized Gains/(Losses) on Cash Flow Hedges        
Accumulated Other Comprehensive (Loss)/Income, Net of Tax        
Beginning balance, Pretax (2) (2) 0  
Period change, Pretax 0 0 (2)  
Pretax- Amount reclassed to earnings 1 0    
Ending balance, Pretax (1) (2) (2)  
Beginning balance, Tax 2 2 0  
Period change, tax (1) 0 2  
Amount reclassified to earnings 0 0    
Ending balance, Tax 1 2 2  
Beginning Balance, value 0 0 0  
Other comprehensive income/(loss)   0 0  
Other comprehensive (loss) before reclassifications (1) 0    
Amount reclassified to earnings 1 0    
Ending Balance, value 0 0 0  
Reclassification of tax benefit from AOCI   0    
Defined Benefit Pension Plans        
Accumulated Other Comprehensive (Loss)/Income, Net of Tax        
Beginning balance, Pretax 2 (5) (7)  
Period change, Pretax (1) 1 2  
Pretax- Amount reclassed to earnings 0 6    
Ending balance, Pretax 1 2 (5)  
Beginning balance, Tax (1) 1 2  
Period change, tax 1 0 (1)  
Amount reclassified to earnings 0 (2)    
Ending balance, Tax 0 (1) 1  
Beginning Balance, value 1 (4) (5)  
Other comprehensive income/(loss)   5 1  
Other comprehensive (loss) before reclassifications 0 1    
Amount reclassified to earnings 0 4    
Ending Balance, value 1 1 (4)  
Reclassification of tax benefit from AOCI   0    
AOCI        
Accumulated Other Comprehensive (Loss)/Income, Net of Tax        
Beginning balance, Pretax (147) (103) (224)  
Period change, Pretax (2) (74) 121  
Pretax- Amount reclassed to earnings 1 30    
Ending balance, Pretax (148) (147) (103)  
Beginning balance, Tax 95 92 117  
Period change, tax 1 13 (25)  
Amount reclassified to earnings 0 2    
Effect of adoption of new accounting principle       $ (8)
Ending balance, Tax 96 95 92  
Beginning Balance, value (52) (11) (107)  
Other comprehensive income/(loss)   (33) 96  
Other comprehensive (loss) before reclassifications (1) (61)    
Amount reclassified to earnings 1 28    
Ending Balance, value $ (52) (52) $ (11)  
Reclassification of tax benefit from AOCI [1]   $ (8)    
[1]
(a) 
Impact of the Company’s adoption of new accounting guidance which allows for the reclassification of the stranded tax effects resulting from the implementation of the Tax Cuts and Jobs Act of 2017. This adoption resulted in an $8 million reclassification of tax benefit from AOCL to Retained Earnings.