Indebtedness (Credit Facilities) (Details)	Dec. 31, 2021 USD ($)
Line of Credit Facility [Line Items]
Committed Credit Facilities	$ 6,300,000,000
364-day revolving credit, expiring February 1, 2022
Line of Credit Facility [Line Items]
Committed Credit Facilities	1,800,000,000
Multi-year revolving credit, expiring February 10, 2026
Line of Credit Facility [Line Items]
Committed Credit Facilities	2,000,000,000.0
Multi-year revolving credit, expiring September 29, 2026
Line of Credit Facility [Line Items]
Committed Credit Facilities	$ 2,500,000,000

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant