CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Millions	Total	Capital Stock	Cap. In Excess of Par Value of Stock	Retained Earnings	Accumulated Other Comprehensive Income/(Loss) (Note 18)	Treasury Stock	Total	Equity Attributable to Non-controlling Interests
Beginning balance at Dec. 31, 2018	$ 35,966	$ 41	$ 22,006	$ 22,668	$ (7,366)	$ (1,417)	$ 35,932	$ 34
Increase (Decrease) in Stockholders' Equity
Adoption of accounting standards	13	0	0	13	0	0	13	0
Net income/(loss)	1,183	0	0	1,146	0	0	1,146	37
Other comprehensive income/(loss), net	(135)	0	0	0	(135)	0	(135)	0
Common stock issued (a)	20	0	20	0	0	0	20	0
Treasury stock/other	(12)	0	0	0	0	(23)	23	35
Cash dividends declared	(601)	0	0	(601)	0	0	(601)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Ending balance at Mar. 31, 2019	$ 36,434	41	22,026	23,226	(7,501)	(1,394)	36,398	36
Increase (Decrease) in Stockholders' Equity
Per share dividend of Common and Class B Stock	$ 0.15
Beginning balance at Dec. 31, 2019	$ 33,230	41	22,165	20,320	(7,728)	(1,613)	33,185	45
Increase (Decrease) in Stockholders' Equity
Adoption of accounting standards	(202)	0	0	(202)	0	0	(202)	0
Net income/(loss)	(1,993)	0	0	(1,993)	0	0	(1,993)	0
Other comprehensive income/(loss), net	(733)	0	0	0	(733)	0	(733)	0
Common stock issued (a)	(15)	0	(15)	0	0	0	(15)	0
Stock Issued During Period, Value, Treasury Stock Reissued	9	0	0	0	0	6	6	3
Dividends and dividend equivalents declared	(598)	0	0	(598)	0	0	(598)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	0
Ending balance at Mar. 31, 2020	$ 29,698	$ 41	$ 22,150	$ 17,527	$ (8,461)	$ (1,607)	$ 29,650	$ 48
Increase (Decrease) in Stockholders' Equity
Per share dividend of Common and Class B Stock	$ 0.15