Equity Equity (Dividends) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended								12 Months Ended		126 Months Ended
	Feb. 15, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2020
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Cash Paid		$ 0.1505	$ 0.1505	$ 0.1505	$ 0.1505
Dividends declared on common stock (per share amount)		$ 0.31	$ 0.15	$ 0	$ 0.15	$ 0.29	$ 0.14	$ 0	$ 0.14	$ 0.6095	$ 0.5804
Treasury Stock, Value, Acquired, Cost Method												$ 1,900
Acquisition of treasury stock (shares)												154,300,000
Treasury Stock Acquired, Average Cost Per Share												$ 12.12
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 264								$ 264
Treasury stock, shares (in shares)		151,923,418				153,028,526				151,923,418	153,028,526	153,028,526
Subsequent Event
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.1580