Parent Company (Interest Paid and Income Tax Refunds (Payments)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Interest paid	$ 582	$ 1,292	$ 3,742
Income Tax Refunds	73	10	17
Parent Company
Condensed Financial Statements, Captions [Line Items]
Interest paid	307	335	300
Income Tax Refunds	$ 386	$ 29	$ 26