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Post-Employment Benefits - Funding and Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans
Defined benefit plans disclosures
Company contributions	$ 400	$ 382
Defined benefit plan, expected contributions in 2021	410
Total benefit payments expected to be paid to participants
2021	340
2022	355
2023	373
2024	395
2025	415
2026 to 2030	2,410
Medical and Dental Plans
Defined benefit plans disclosures
Company contributions	12	$ 12
Total benefit payments expected to be paid to participants
2021	72
2022	73
2023	74
2024	75
2025	76
2026 to 2030	$ 394

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