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Revenue (Narratives) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition
Deferred revenue	$ 67	$ 106	$ 58
Remaining revenue recognition	740	741	$ 718
Remaining performance obligation	$ 20,500
Adjustments | ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition
Contract assets		2
Deferred revenue		$ 105

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