Other Financial Data (Other Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities [Abstract]
Defined benefit plans	$ 1,799	$ 1,512
Postretirement Health Care Benefit Plan	0	49
Deferred revenue	115	113
Unrecognized tax benefits	39	50
Deferred income taxes	121	12
Deferred consideration (Note 14)	72	0
Other	209	168
Other liabilities	$ 2,355	$ 1,904