Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Income (Loss) Attributable to Common Shareowners
Income (loss) from continuing operations	$ 146	$ 151	$ (3,844)	$ 438	$ 657	$ 958	$ 1,183	$ 712	$ (3,109)	$ 3,510	$ 1,216
Income (loss) from discontinued operations attributable to common shareowners	(11)	113	9	(521)	486	190	717	634	(410)	2,027	4,053
Net income (loss) attributable to common shareowners	$ 135	$ 264	$ (3,835)	$ (83)	$ 1,143	$ 1,148	$ 1,900	$ 1,346	$ (3,519)	$ 5,537	$ 5,269
Basic weighted average number of shares outstanding									1,357.8	854.8	800.4
Stock awards and equity units (share equivalent)									0.0	9.1	9.7
Diluted weighted average number of shares outstanding									1,357.8	863.9	810.1
Earnings (loss) per share attributable to common shareowners - basic
Income (loss) from continuing operations	$ 0.10	$ 0.10	$ (2.56)	$ 0.51	$ 0.77	$ 1.12	$ 1.38	$ 0.84	$ (2.29)	$ 4.11	$ 1.52
Income (loss) from discontinued operations	(0.01)	0.08	0.01	(0.61)	0.56	0.22	0.84	0.74	(0.30)	2.37	5.06
Net income (loss) attributable to common shareowners	0.09	0.17	(2.55)	(0.10)	1.33	1.34	2.22	1.58	(2.59)	6.48	6.58
Earnings Per Share of Common Stock - Diluted
Income (loss) from continuing operations	0.10	0.10	(2.56)	0.50	0.76	1.11	1.37	0.83	(2.29)	4.06	1.50
Income (loss) from discontinued operations	(0.01)	0.08	0.01	(0.60)	0.56	0.22	0.83	0.73	(0.30)	2.35	5.00
Net income (loss) attributable to common shareowners	$ 0.09	$ 0.17	$ (2.55)	$ (0.10)	$ 1.32	$ 1.33	$ 2.20	$ 1.56	$ (2.59)	$ 6.41	$ 6.50
Antidilutive securities excluded from computation of earnings per share amount									32.5	8.3	5.1