Note 8—Drilling Fleet

Construction work in progress—For the nine months ended September 30, 2016 and 2015, the changes in our construction work in progress, including capital expenditures and other capital additions, were as follows (in millions):


	Nine months ended
	September 30,
	2016		2015
Construction work in progress, at beginning of period	$	3,736	$	2,451

Capital expenditures
Newbuild construction program		959		1,054
Other equipment and construction projects		113		282
Total capital expenditures		1,072		1,336
Changes in accrued capital additions		(90)		(57)
Impairment of construction work in progress		—		(52)

Property and equipment placed into service
Newbuild construction program		(1,672)		—
Other property and equipment		(203)		(398)
Construction work in progress, at end of period	$	2,843	$	3,280

Dispositions—During the nine months ended September 30, 2016, in connection with our efforts to dispose of non‑strategic assets, we completed the sale of the deepwater floater Deepwater Navigator and the midwater floaters Falcon 100, GSF Grand Banks, GSF Rig 135, Sedneth 701 and Transocean John Shaw, along with related equipment. In the nine months ended September 30, 2016, we received aggregate net cash proceeds of $11 million, and in the three and nine months ended September 30, 2016, we recognized an aggregate net gain of $3 million and $8 million, respectively, associated with the disposal of these assets. In the three and nine months ended September 30, 2016, we received cash proceeds of $1 million and $5 million, respectively, and recognized an aggregate net loss of $2 million and $8 million, respectively, associated with the disposal of assets unrelated to rig sales.

During the nine months ended September 30, 2015, in connection with our efforts to dispose of non‑strategic assets, we completed the sale of the ultra‑deepwater floaters Deepwater Expedition and GSF Explorer, the deepwater floaters Discoverer Seven Seas, Sedco 707, Sedco 710 and Sovereign Explorer and the midwater floaters C. Kirk Rhein, Jr., GSF Arctic I, GSF Arctic III, J.W. McLean, Sedco 601, Sedco 700 and Transocean Legend, along with related equipment. In the three and nine months ended September 30, 2015, we received aggregate net cash proceeds of $1 million and $25 million, respectively, and recognized an aggregate net gain of $1 million and $7 million, respectively, associated with the disposal of these assets. In the three and nine months ended September 30, 2015, we received cash proceeds of $2 million and $8 million, respectively, and recognized an aggregate net loss of $16 million and $27 million, respectively, associated with the disposal of assets unrelated to rig sales.

During the nine months ended September 30, 2016, we committed to a plan to sell the deepwater floater Sedco 702 and the midwater floaters Transocean Driller and Transocean Winner, along with related equipment. At September 30, 2016, the aggregate carrying amount of our assets held for sale was $6 million, including the deepwater floater Sedco 702 and the midwater floaters Transocean Driller and Transocean Winner, along with related equipment. At December 31, 2015, the aggregate carrying amount of our assets held for sale was $8 million, including the deepwater floater Deepwater Navigator and the midwater floaters Falcon 100, GSF Grand Banks, GSF Rig 135 and Sedneth 701, along with related equipment, and certain corporate assets. See Note 5—Impairments. See Note 15—Subsequent Events.