Consolidated Statement of Changes in Equity (Unaudited) - USD ($) $ in Millions	Total	Total Stockholders’ Equity	Preferred Stock	Common Stock	Capital in Excess of Par Value	Retained Deficit	AOCI*	Treasury Stock	Noncontrolling Interests
Period Start at Dec. 31, 2019	$ 16,364	$ 13,363	$ 35	$ 1,247	$ 24,323	$ (11,002)	$ (199)	$ (1,041)	$ 3,001
Net income (loss)	(255)	(214)	0	0	0	(214)	0	0	(41)
Other comprehensive income (loss)	23	23	0	0	0	0	23	0	0
Cash dividends – common stock	(971)	(971)	0	0	0	(971)	0	0	0
Dividends and distributions to noncontrolling interests	(98)	0	0	0	0	0	0	0	(98)
Stock-based compensation and related common stock issuances, net of tax	21	21	0	1	20	0	0	0	0
Contributions from noncontrolling interests	4	0	0	0	0	0	0	0	4
Other	(8)	(10)	0	0	0	(10)	0	0	2
Net increase (decrease) in equity	(1,284)	(1,151)	0	1	20	(1,195)	23	0	(133)
Period End at Jun. 30, 2020	15,080	12,212	35	1,248	24,343	(12,197)	(176)	(1,041)	2,868
Period Start at Mar. 31, 2020	15,259	12,354	35	1,248	24,330	(12,013)	(205)	(1,041)	2,905
Net income (loss)	315	303	0	0	0	303	0	0	12
Other comprehensive income (loss)	29	29	0	0	0	0	29	0	0
Cash dividends – common stock	(486)	(486)	0	0	0	(486)	0	0	0
Dividends and distributions to noncontrolling interests	(54)	0	0	0	0	0	0	0	(54)
Stock-based compensation and related common stock issuances, net of tax	13	13	0	0	13	0	0	0	0
Contributions from noncontrolling interests	2	0	0	0	0	0	0	0	2
Other	2	(1)	0	0	0	(1)	0	0	3
Net increase (decrease) in equity	(179)	(142)	0	0	13	(184)	29	0	(37)
Period End at Jun. 30, 2020	15,080	12,212	35	1,248	24,343	(12,197)	(176)	(1,041)	2,868
Period Start at Dec. 31, 2020	14,583	11,769	35	1,248	24,371	(12,748)	(96)	(1,041)	2,814
Net income (loss)	757	730	0	0	0	730	0	0	27
Other comprehensive income (loss)	(14)	(14)	0	0	0	0	(14)	0	0
Cash dividends – common stock	(996)	(996)	0	0	0	(996)	0	0	0
Dividends and distributions to noncontrolling interests	(95)	0	0	0	0	0	0	0	(95)
Stock-based compensation and related common stock issuances, net of tax	31	31	0	1	30	0	0	0	0
Contributions from noncontrolling interests	6	0	0	0	0	0	0	0	6
Other	(7)	(8)	0	0	0	(8)	0	0	1
Net increase (decrease) in equity	(318)	(257)	0	1	30	(274)	(14)	0	(61)
Period End at Jun. 30, 2021	14,265	11,512	35	1,249	24,401	(13,022)	(110)	(1,041)	2,753
Period Start at Mar. 31, 2021	14,473	11,702	35	1,249	24,384	(12,825)	(100)	(1,041)	2,771
Net income (loss)	322	304	0	0	0	304	0	0	18
Other comprehensive income (loss)	(10)	(10)	0	0	0	0	(10)	0	0
Cash dividends – common stock	(498)	(498)	0	0	0	(498)	0	0	0
Dividends and distributions to noncontrolling interests	(41)	0	0	0	0	0	0	0	(41)
Stock-based compensation and related common stock issuances, net of tax	20	20	0	0	20	0	0	0	0
Contributions from noncontrolling interests	4	0	0	0	0	0	0	0	4
Other	(5)	(6)	0	0	(3)	(3)	0	0	1
Net increase (decrease) in equity	(208)	(190)	0	0	17	(197)	(10)	0	(18)
Period End at Jun. 30, 2021	$ 14,265	$ 11,512	$ 35	$ 1,249	$ 24,401	$ (13,022)	$ (110)	$ (1,041)	$ 2,753