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Lease Commitments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Right-of-use assets and lease liabilities, percent recognized from joint venture	100.00%
Future undiscounted cash flows for operating leases not yet commenced	$ 790
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	$ 3,885
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities		$ 2,000

X

- Definition

Lessee, Cash Flows for Operating Lease, Lease Not yet Commenced

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Right-of-use Assets and Lease Liabilities, Percent Recognized from Joint Venture

+ References

No definition available.

+ Details

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X

- References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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X

- Details

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