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Employee Benefit Plans - Textual (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlements	$ 0		$ 0	$ 0	$ 0
Curtailments				0	0
U.S.
Defined Benefit Plan Disclosure [Line Items]
Expected company contributions	475			475
U.S. \| Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contributions				409
Settlements	28		27	72	28
Increase (decrease) in net pension liability				(106)
Curtailments		$ 12		12	0
Int'l (Pension Benefits) [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected company contributions	115			115
Int'l (Pension Benefits) [Member] \| Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contributions				104
Settlements	$ 0		$ 0	0	(1)
Curtailments				$ 0	$ 0