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Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 17,146 $ 16,840 $ 17,231 $ 16,985
Other comprehensive income (loss) (39) (9) (33) (51)
Ending Balance 17,185 16,854 17,185 16,854
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (220) (178) (227) (136)
Other comprehensive income (loss) (40) (9) (33) (52)
Income tax benefit (expense) 1 0 1 1
Other comprehensive income (loss) (39) (9) (32) (51)
Ending Balance (259) (187) (259) (187)
Comprehensive income from equity method investment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 1 2 2 2
Other comprehensive income (loss) 0 0 (1) 0
Income tax benefit (expense) 0 0 0 0
Other comprehensive income (loss) 0 0 (1) 0
Ending Balance 1 2 1 2
Employee benefit plans adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (90) (89) (90) (89)
Other comprehensive income (loss) 0 0 0 0
Income tax benefit (expense) 0 0 0 0
Other comprehensive income (loss) 0 0 0 0
Ending Balance (90) (89) (90) (89)
Accumulated other comprehensive loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (309) (265) (315) (223)
Other comprehensive income (loss) (40) (9) (34) (52)
Income tax benefit (expense) 1 0 1 1
Other comprehensive income (loss) (39) (9) (33) (51)
Ending Balance $ (348) $ (274) $ (348) $ (274)