Earnings Per Share Of Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Amount of beneficial conversion				$ 0	$ 296
EPS of Common Stock
Income from continuing operations		$ 341	$ 308	696	489
Less: Preferred dividends		0	0	(3)	(43)
Less: Amortization of beneficial conversion feature		0	(148)	0	(261)
Less: Undistributed earnings allocated to preferred stockholders		(5)	(18)	(7)	0
Income from continuing operations available to common stockholders		336	142	686	185
Discontinued operations, net of tax	[1]	(29)	(9)	(64)	1,179
Less: Undistributed earnings allocated to preferred stockholders		1	1	1	0
Income (loss) from discontinued operations available to common stockholders		(28)	(8)	(63)	1,179
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS		$ 308	$ 134	$ 623	$ 1,364
Share Count information:
Weighted average number of basic shares outstanding (in shares)		532	477	531	477
Assumed exercise of dilutive stock options and awards (in shares)		1	2	2	1
Weighted average number of diluted shares outstanding		533	479	533	478
Income (loss) available to common stockholders, per common share:
Income from continuing operations, basic (in dollars per share)		$ 0.63	$ 0.30	$ 1.29	$ 0.39
Discontinued operations, basic (in dollars per share)		(0.05)	(0.02)	(0.12)	2.47
Basic - Net Income Attributable to Common Stockholders (in dollars per share)		0.58	0.28	1.17	2.86
Income from continuing operations, diluted (in dollars per share)		0.63	0.30	1.29	0.39
Discontinued operations, diluted (in dollars per share)		(0.05)	(0.02)	(0.12)	2.46
Diluted - Net Income Attributable to Common Stockholders (in dollars per share)		$ 0.58	$ 0.28	$ 1.17	$ 2.85
Stock Options
Income (loss) available to common stockholders, per common share:
Shares excluded from the calculation of diluted shares outstanding, in shares		0	1	0	1
Preferred Stock
Income (loss) available to common stockholders, per common share:
Shares excluded from the calculation of diluted shares outstanding, in shares		8	59	8	59

[1] Net of income tax expense (benefits) of $39 million and $(16) million for the three months ended June 30, 2019 and 2018, respectively, and $44 million and $(887) million for the six months ended June 30, 2019 and 2018, respectively.