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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary of quarterly results of operations
Revenues	$ 4,949	$ 5,031	$ 4,999	$ 4,904	$ 4,534	$ 4,546	$ 4,359	$ 4,343	$ 19,883	$ 17,782	$ 14,178
Gross margin	446	564	254	546	354	471	466	434	1,810	1,725	1,527
Impairment losses	269	129	72	0					470	0	0
Restructuring and separation costs	73	118	43	0					234	0	0
Net (loss) income	$ (262)	$ (97)	$ (230)	$ 77	$ (47)	$ 42	$ 33	$ 24	$ (512)	$ 52	$ 143
Net income per share:
Basic (in dollars per share)	$ (4.59)	$ (1.70)	$ (4.10)	$ 1.38	$ (0.85)	$ 0.77	$ 0.58	$ 0.44	$ (9.07)	$ 0.93	$ 2.75
Diluted (in dollars per share)	$ (4.59)	$ (1.70)	$ (4.10)	$ 1.37	$ (0.85)	$ 0.76	$ 0.58	$ 0.43	$ (9.07)	$ 0.92	$ 2.58
Restatement Adjustment
Net income per share:
Increase to gross profit					$ 13	$ 14	$ 12	$ 14

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