Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share Table [Line Items]
Net income (loss) available to common stockholders	$ 379	$ 425
Basic weighted-average shares	1,216,940	1,214,646
Effect of dilutive securities:
Diluted weighted-average shares	1,221,279	1,217,211
Earnings (loss) per common share:
Basic	$ 0.31	$ 0.35
Diluted	$ 0.31	$ 0.35
Nonvested restricted stock units [Member]
Effect of dilutive securities:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	4,128	2,565
Stock Options [Member]
Effect of dilutive securities:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	211	0