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Post-Employment Benefits - Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	$ 12,371	$ 10,637
Unfunded commitments to investments in the private funds	523	579
U.S. large cap
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	3,410	2,873
U.S. mid and small cap
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	775	648
International
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	2,654	2,202
U.S. government securities
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	475	562
Corporate debt instruments
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	1,408	1,266
Non U.S. government securities
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	523	445
Other
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	503	320
Absolute return funds
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	1,618	1,557
Cash and Cash Equivalents
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	281	182
Other
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	724	582
Quoted Prices in Active Markets
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	4,636	3,661
Quoted Prices in Active Markets | U.S. large cap
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	2,202	1,647
Quoted Prices in Active Markets | U.S. mid and small cap
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	721	548
Quoted Prices in Active Markets | International
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	542	464
Quoted Prices in Active Markets | U.S. government securities
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	23	52
Quoted Prices in Active Markets | Corporate debt instruments
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	425	362
Quoted Prices in Active Markets | Non U.S. government securities
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	16	3
Quoted Prices in Active Markets | Other
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	159	69
Quoted Prices in Active Markets | Absolute return funds
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	462	424
Quoted Prices in Active Markets | Cash and Cash Equivalents
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	77	84
Quoted Prices in Active Markets | Other
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	9	8
Significant Other Observable Inputs
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	1,269	1,114
Significant Other Observable Inputs | U.S. mid and small cap
Defined benefit plans disclosures
Defined benefit plans' assets at fair value		4
Significant Other Observable Inputs | U.S. government securities
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	289	357
Significant Other Observable Inputs | Corporate debt instruments
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	908	724
Significant Other Observable Inputs | Non U.S. government securities
Defined benefit plans disclosures
Defined benefit plans' assets at fair value		2
Significant Other Observable Inputs | Other
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	72	27
Significant Unobservable Inputs
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	3	3
Significant Unobservable Inputs | U.S. mid and small cap
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	3	2
Significant Unobservable Inputs | Other
Defined benefit plans disclosures
Defined benefit plans' assets at fair value		1
Measured at NAV
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	6,463	5,859
Measured at NAV | U.S. large cap
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	1,208	1,226
Measured at NAV | U.S. mid and small cap
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	51	94
Measured at NAV | International
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	2,112	1,738
Measured at NAV | U.S. government securities
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	163	153
Measured at NAV | Corporate debt instruments
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	75	180
Measured at NAV | Non U.S. government securities
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	507	440
Measured at NAV | Other
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	272	224
Measured at NAV | Absolute return funds
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	1,156	1,133
Measured at NAV | Cash and Cash Equivalents
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	204	98
Measured at NAV | Other
Defined benefit plans disclosures
Defined benefit plans' assets at fair value	$ 715	$ 573
Equities | Minimum
Defined benefit plans disclosures
Redemption notice period	7 days
Equities | Maximum
Defined benefit plans disclosures
Redemption notice period	30 days
Fixed Income Securities
Defined benefit plans disclosures
Maximum amount of fund with redemption limit to 33%	$ 245
Maximum amount of fund with redemption limit to 25%	$ 110
Maximum redemption fund percentage - 33%	33.00%
Maximum redemption fund percentage - 25%	25.00%
Investments that are subject to lock until 2022	$ 60
Fixed Income Securities | Minimum
Defined benefit plans disclosures
Redemption notice period	2 days
Fixed Income Securities | Maximum
Defined benefit plans disclosures
Redemption notice period	14 days
Absolute return funds | Minimum
Defined benefit plans disclosures
Redemption notice period	5 days
Absolute return funds | Maximum
Defined benefit plans disclosures
Redemption notice period	90 days

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