Employee Benefit Plans - Textual (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Company contributions		$ 87
Expected company contributions	$ 135	135
U.S. \| Qualified Plan [Member] \| Pension Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Expense (Reversal of Expense), Noncash	27
Increase (Decrease) in Obligation, Pension Benefits	78
Int'l (Pension Benefits) [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contributions		57
Expected company contributions	$ 65	$ 65

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year.

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Amount of increase (decrease) in obligation for pension benefits. Includes, but is not limited to, defined benefit or defined contribution plans. Excludes other postretirement benefits.

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Amount of noncash expense (reversal of expense) for pension benefits. Excludes other postretirement benefits.

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