estimates as a result of changes in assumptions and actual investment returns, among other factors.
Cash Flows Used in Investing Activities
The following table provides a summary of the major items affecting our cash flows used in investing
activities:
For the Years Ended December 31,
2018
2017
2016
(In millions)

Net capital expenditures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . $
Acquisitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Other investing activities, net (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(1,586) $
(398)
(52)

(1,434) $
(177)
(61)

(1,311)
(204)
(75)

Net cash flows used in investing activities . . . . . . . . . . . . . . . . . . . . . . . . . .

(2,036) $

(1,672) $

(1,590)

(a)