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Stockholders' Equity (Narrative) (Details) - USD ($)		3 Months Ended				6 Months Ended
	Aug. 04, 2020	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Dec. 31, 2019	Feb. 28, 2019	Jun. 30, 2018	Mar. 31, 2018
Stockholders Equity [Abstract]
Common stock dividends, rate per share		$ 0.11	$ 0.09	$ 0.09	$ 0.08
Percentage of increase to quarterly dividend		22.00%				22.00%
Subsequent Event [Member]
Stockholders Equity [Abstract]
Dividend payable amount, per share	$ 0.26
Dividend payable amount	$ 100,000,000
Dividend payable date	Oct. 01, 2020
Dividend payable date of record	Aug. 14, 2020
Share Repurchase Programs [Member]
Stockholders Equity [Abstract]
Share-repurchase program, authorized amount								$ 5,000,000,000.0	$ 4,000,000,000.0	$ 1,000,000,000.0
5.0 Billion Dollar Share Repurchase Program [Member]
Stockholders Equity [Abstract]
Share-repurchase program expiration date						Dec. 31, 2019
1.0 Billion Dollar Share Repurchase Program [Member]
Stockholders Equity [Abstract]
Share-repurchase program, authorized amount							$ 1,000,000,000.0
Share-repurchase program expiration date						Dec. 31, 2020
Stock-repurchase program, conditioned amount							$ 800,000,000
Minimum [Member]
Stockholders Equity [Abstract]
Share-repurchase program, cash proceeds required for conditioned amount		$ 725,000,000				$ 725,000,000

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