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Components of Other Comprehensive Earnings (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Beginning Balance $ 9,845
Ending Balance $ 10,944
Interest expense recognition period 10 years
Interest Rate Swap Contracts [Member]  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Beginning Balance $ 1
Other comprehensive gain/(loss) before reclassifications (1)
Ending Balance 0
Interest expense 1
Provision (benefit) for income taxes 0
Foreign Currency Translation Adjustments [Member]  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Beginning Balance (314)
Other comprehensive gain/(loss) before reclassifications 25
Ending Balance (289)
Other [Member]  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Beginning Balance (18)
Other comprehensive gain/(loss) before reclassifications (25)
Ending Balance (43)
Accumulated Other Comprehensive Income (Loss) [Member]  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Beginning Balance (331)
Other comprehensive gain/(loss) before reclassifications (1)
Ending Balance $ (332)