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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended													12 Months Ended
	Feb. 02, 2022	Nov. 30, 2021	Dec. 31, 2019	Mar. 31, 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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2019	Feb. 28, 2022	Feb. 01, 2021	Dec. 31, 2018
Stockholders Equity [Abstract]
Common stock, shares authorized (in shares)					1,000,000,000.0				1,000,000,000.0
Common stock, par value (in dollars per share)					$ 0.10				$ 0.10
Preferred Stock, Shares Authorized					4,500,000
Preferred Stock, Par or Stated Value Per Share					$ 1.00
Dividends rate per share					$ 0.84	$ 0.49	$ 0.34	$ 0.30	0.37	$ 0.11	$ 0.11	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.08
Fixed Dividend [Member]
Stockholders Equity [Abstract]
Dividend payable amount																			$ 106
Fixed Dividend [Member] | Minimum [Member]
Stockholders Equity [Abstract]
Dividends rate per share												$ 0.09				$ 0.08
Fixed Dividend [Member] | Maximum [Member]
Stockholders Equity [Abstract]
Dividends rate per share											$ 0.11				$ 0.09
Special Dividend Paid [Member]
Stockholders Equity [Abstract]
Dividends rate per share									$ 0.26
Dividend payable amount									$ 97
Subsequent Event
Stockholders Equity [Abstract]
Dividend payable, year	2022
Dividends payable, per share	$ 1.00
Subsequent Event | Fixed Dividend [Member]
Stockholders Equity [Abstract]
Percentage of increase to quarterly dividend				45.00%
Dividends rate per share	$ 0.16			$ 0.16
Subsequent Event | Variable Dividend [Member]
Stockholders Equity [Abstract]
Dividend payable amount	$ 557
Dividends payable, per share	$ 0.84
Share Repurchase Program [Member] | Subsequent Event
Stockholders Equity [Abstract]
Share-repurchase program, authorized amount																		$ 1,600
5.0 Billion Dollar Share Repurchase Program Closed [Member]
Stockholders Equity [Abstract]
Share-repurchase program, authorized amount																				$ 5,000
Share-repurchase program expiration date																	Dec. 31, 2019
1.0 Billion Dollar Share Repurchase Program Closed [Member]
Stockholders Equity [Abstract]
Share-repurchase program, authorized amount			$ 1,000										$ 1,000				$ 1,000
Share-repurchase program expiration date			Dec. 31, 2020
1.0 Billion Dollar Share Repurchase Program Open [Member]
Stockholders Equity [Abstract]
Share-repurchase program, authorized amount		$ 1,000
Share-repurchase program expiration date		Dec. 31, 2022

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