CONSOLIDATED STATEMENTS 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
Increase (Decrease) in Stockholders' Equity
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 13	$ 0	$ 0	$ 13	$ 0	$ 0	$ 13	$ 0
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
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, 2018	$ 35,966	41	22,006	22,668	(7,366)	(1,417)	35,932	34
Increase (Decrease) in Stockholders' Equity
Net income/(loss)	1,333
Other comprehensive income/(loss), net	(70)
Ending balance at Jun. 30, 2019	$ 36,136	41	22,111	22,769	(7,436)	(1,388)	36,097	39
Increase (Decrease) in Stockholders' Equity
Per share dividend of Common and Class B Stock	$ 0.30
Beginning balance at Mar. 31, 2019	$ 36,434	41	22,026	23,226	(7,501)	(1,394)	36,398	36
Increase (Decrease) in Stockholders' Equity
Net income/(loss)	150	0	0	148	0	0	148	2
Other comprehensive income/(loss), net	65	0	0	0	65	0	65	0
Common stock issued (a)	85	0	85	0	0	0	85	0
Treasury stock/other	7	0	0	0	0	6	6	1
Cash dividends declared	(605)	0	0	(605)	0	0	(605)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders								0
Ending balance at Jun. 30, 2019	$ 36,136	41	22,111	22,769	(7,436)	(1,388)	36,097	39
Increase (Decrease) in Stockholders' Equity
Per share dividend of Common and Class B Stock	$ 0.15
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (202)	0	0	(202)	0	0	(202)	0
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
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
Treasury stock/other	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
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
Net income/(loss)	(875)
Other comprehensive income/(loss), net	(743)
Ending balance at Jun. 30, 2020	$ 30,855	41	22,210	18,645	(8,471)	(1,601)	30,824	31
Increase (Decrease) in Stockholders' Equity
Per share dividend of Common and Class B Stock	$ 0.15
Beginning balance at Mar. 31, 2020	$ 29,698	41	22,150	17,527	(8,461)	(1,607)	29,650	48
Increase (Decrease) in Stockholders' Equity
Net income/(loss)	1,118	0	0	1,117	0	0	1,117	1
Other comprehensive income/(loss), net	(10)	0	0	0	(10)	0	(10)	0
Common stock issued (a)	60	0	60	0	0	0	60	0
Treasury stock/other	(12)	0	0	0	0	6	6	(18)
Dividends and dividend equivalents declared	(1)	0	0	1	0	0	1
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders								0
Ending balance at Jun. 30, 2020	$ 30,855	$ 41	$ 22,210	$ 18,645	$ (8,471)	$ (1,601)	$ 30,824	$ 31
Increase (Decrease) in Stockholders' Equity
Per share dividend of Common and Class B Stock	$ 0.00