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Venezuela (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
bolivar / $
$ / shares
Foreign Currency [Line Items]        
Pretax charge for Venezuela deconsolidation   $ 0 $ 0 $ 1,084
Pretax remeasurement charges   $ 0 $ 0 34
CP Venezuela        
Foreign Currency [Line Items]        
Aftertax charge for Venezuela deconsolidation       1,058
Pretax charge for Venezuela deconsolidation       $ 1,084
Aftertax charge for Venezuela deconsolidation (in dollars per share) | $ / shares       $ 1.16
Charge for Venezuela deconsolidation - portion related to investment in CP Venezuela       $ 952
Reclassification due to Venezuela deconsolidation - cumulative translation adjustment, before-tax       111
Income tax benefit, principally related to changes in Venezuela foreign currency regime $ 210      
Pretax remeasurement charges       34
Aftertax remeasurement charge       $ 22
Impact of aftertax remeasurement charge, diluted (in dollars per share) | $ / shares       $ 0.02
VENEZUELA        
Foreign Currency [Line Items]        
SICAD exchange rate (in bolivares per USD) | bolivar / $       13.50
Official exchange rate (in bolivares per USD) | bolivar / $       6.30