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Consolidated Statements of Changes in Equity (Parentheticals) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Equity $ 11,106 $ 11,067 $ 11,685
Cumulative translation adjustments      
Equity 72   67
Additional paid-in capital      
Equity 283 283 283
Convertible borrowings - equity component      
Equity $ 38 $ 38 $ 38