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Restructuring Charges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Charges      
Beginning Balance $ 383 $ 261 $ 470
Restructuring charges, net of revisions 42 329 (26)
Payments (235) (192) (155)
Other non-cash 9 (15) (28)
Ending Balance 199 383 261
Employee Severance [Member]      
Restructuring Charges      
Beginning Balance 360 238 435
Restructuring charges, net of revisions 34 305 (33)
Payments (219) (171) (141)
Other non-cash 11 (12) (23)
Ending Balance 186 360 238
Other Terminations [Member]      
Restructuring Charges      
Beginning Balance 23 23 35
Restructuring charges, net of revisions 8 24 7
Payments (16) (21) (14)
Other non-cash (2) (3) (5)
Ending Balance $ 13 $ 23 $ 23