Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Common Stock, Dividends, Per Share, Cash Paid		$ 1.33	$ 1.33
Dividends, Common Stock, Cash	[1]	$ 579	$ 581
Common stock repurchased during period, shares				0.4
Purchases of common stock				$ (68)	$ (74)
Availability Under ATM		$ 750		$ 750
Common Stock [Member]
Dividends Payable, Date Declared		May 21, 2021	Feb. 18, 2021
Dividends Payable, Date of Record		Jun. 14, 2021	Mar. 15, 2021
Dividends Payable, Date to be Paid		Jun. 30, 2021	Mar. 31, 2021

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