Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Senior Preferred Stock	Preferred Stock	Common Stock	Accumulated Deficit	Accumulated Other Comprehensive Income	Treasury Stock
Balance (shares) at Dec. 31, 2020		1	556	1,158
Balance at Dec. 31, 2020	$ 25,259	$ 120,836	$ 19,130	$ 687	$ (108,110)	$ 116	$ (7,400)
Comprehensive income:
Net income	12,145				12,145
Other comprehensive income (loss), net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of tax	(4)					(4)
Reclassification adjustment for gains included in net income, net of tax	(50)					(50)
Prior service cost and actuarial gains, net of amortization for defined benefit plans, net of tax	(5)					(5)
Total comprehensive income	12,086
Balance (shares) at Jun. 30, 2021		1	556	1,158
Balance at Jun. 30, 2021	37,345	$ 120,836	$ 19,130	$ 687	(95,965)	57	(7,400)
Balance (shares) at Mar. 31, 2021		1	556	1,158
Balance at Mar. 31, 2021	30,225	$ 120,836	$ 19,130	$ 687	(103,117)	89	(7,400)
Comprehensive income:
Net income	7,152				7,152
Other comprehensive income (loss), net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of tax	2					2
Reclassification adjustment for gains included in net income, net of tax	(33)					(33)
Prior service cost and actuarial gains, net of amortization for defined benefit plans, net of tax	(1)					(1)
Total comprehensive income	7,120
Balance (shares) at Jun. 30, 2021		1	556	1,158
Balance at Jun. 30, 2021	37,345	$ 120,836	$ 19,130	$ 687	(95,965)	57	(7,400)
Balance (shares) at Dec. 31, 2021		1	556	1,158
Balance at Dec. 31, 2021	47,357	$ 120,836	$ 19,130	$ 687	(85,934)	38	(7,400)
Comprehensive income:
Net income	9,061				9,061
Other comprehensive income (loss), net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of tax	(15)					(15)
Reclassification adjustment for gains included in net income, net of tax	8					8
Prior service cost and actuarial gains, net of amortization for defined benefit plans, net of tax	(4)					(4)
Total comprehensive income	9,050
Balance (shares) at Jun. 30, 2022		1	556	1,158
Balance at Jun. 30, 2022	56,407	$ 120,836	$ 19,130	$ 687	(76,873)	27	(7,400)
Balance (shares) at Mar. 31, 2022		1	556	1,158
Balance at Mar. 31, 2022	51,758	$ 120,836	$ 19,130	$ 687	(81,526)	31	(7,400)
Comprehensive income:
Net income	4,653				4,653
Other comprehensive income (loss), net of tax effect:
Changes in net unrealized gains on available-for-sale securities, net of tax	(6)					(6)
Reclassification adjustment for gains included in net income, net of tax	4					4
Prior service cost and actuarial gains, net of amortization for defined benefit plans, net of tax	(2)					(2)
Total comprehensive income	4,649
Balance (shares) at Jun. 30, 2022		1	556	1,158
Balance at Jun. 30, 2022	$ 56,407	$ 120,836	$ 19,130	$ 687	$ (76,873)	$ 27	$ (7,400)