CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income		$ 1,869	$ 190	$ 3,425	$ 814
Other comprehensive income (loss) items:
Foreign currency translation gains		0	2	0	3
Unrealized gains (losses) on derivatives	[1]	(1)	8	(5)	14
Pension and postretirement gains (losses)	[2]	144	4	153	12
Reclassification of realized (gains) losses on derivatives	[3]	10	0	13	(1)
Other comprehensive income, net of tax		153	14	161	28
Comprehensive income		$ 2,022	$ 204	$ 3,586	$ 842

[1] Net of tax of zero and $(5) for the three months ended September 30, 2018, and 2017, respectively, and $1 and $(8) for the nine months ended September 30, 2018, and 2017, respectively.

[2] Net of tax of $(40) and $(3) for the three months ended September 30, 2018, and 2017, respectively, and $(43) and $(7) for the nine months ended September 30, 2018, and 2017, respectively. The three and nine months ended September 30, 2018 include $139 ($178 pre-tax) of other comprehensive income related to a postretirement benefit plan design change. Please refer to Note 9.

[3] Net of tax of $(3) and zero for the three months ended September 30, 2018, and 2017, respectively, and $(4) and $1 for the nine months ended September 30, 2018, and 2017, respectively.