Stockholders' Equity Declaration and Payment of Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021		Sep. 30, 2021		Jun. 30, 2021		Mar. 31, 2021		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Class of Stock [Line Items]
Dividends, Common Stock, Cash	$ 639	[1]	$ 578	[1]	$ 579	[1]	$ 581	[1]	$ 2,377	$ 2,106	$ 1,917
Common Stock, Dividends, Per Share, Cash Paid	$ 1.47		$ 1.33		$ 1.33		$ 1.33
Dividends, Preferred Stock, Cash										$ 57	$ 113
Common Stock [Member]
Class of Stock [Line Items]
Dividends Payable, Date Declared	Oct. 18, 2021		Aug. 05, 2021		May 21, 2021		Feb. 18, 2021
Dividends Payable, Date of Record	Dec. 15, 2021		Sep. 15, 2021		Jun. 14, 2021		Mar. 15, 2021
Payment Date	Dec. 31, 2021		Sep. 30, 2021		Jun. 30, 2021		Mar. 31, 2021

[1] Inclusive of dividends accrued for holders of unvested RSUs, which will be paid when and if the RSUs vest.