Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Stockholders' Equity (Common Stock, Narrative) (Details) - USD ($)		1 Months Ended
	Mar. 20, 2020	Mar. 31, 2019	Feb. 28, 2017	Mar. 31, 2018	Feb. 28, 2018
Stockholders' Equity Note [Abstract]
Stock repurchased program period		2 years	2 years
Stock repurchase program, approved amount		$ 2,550,000,000	$ 1,750,000,000
Stock repurchased	$ 1,407,000,000
Stock repurchase program, authorized increase				$ 200,000,000
Stock repurchase program, remaining amount				$ 1,075,000,000.000	$ 875,000,000