Equity (Compensation Expense Related to Stock-Based Compensation - Related to Phantom Stock-Based Awards) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	$ 173	$ 127	$ 150
Income tax benefit	36	27	32
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	9	6	7
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	98	63	89
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation Expense	$ 66	$ 58	$ 54