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Stockholders' Equity - Common Equity (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended			37 Months Ended
	Jan. 20, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Jul. 19, 2017	Dec. 19, 2014
Class of Stock [Line Items]
Common share buy-back program, amount						$ 2,000
Value of shares repurchased		$ 50	$ 2	$ 273	$ 575
Common share buy-back program, average price per share					$ 17.71
Per common share cash dividend declared for the period		$ 1.05	$ 1.00	$ 0.80
Per common share cash dividend paid in the period		$ 1.0375	$ 0.95	$ 0.725
Subsequent Event
Class of Stock [Line Items]
Per common share cash dividend declared for the period	$ 0.2625
Equity distribution agreement | Class P
Class of Stock [Line Items]
Value of Stock Available for Sale Under Equity Distribution Agreement							$ 5,000
Share issued (in shares)		0	0	0
Common stock
Class of Stock [Line Items]
Shares repurchased		4,000,000	100,000	15,000,000	32,000,000

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