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Employee Benefit Plans - Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	$ 93	$ 112	$ 129
U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	9,930	10,177
U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	4,747	4,002
U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,171	2,117
U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	44	51
U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	3,968	4,007
Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	5,363	4,791
Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,406	1,388
Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	798	715
Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	49	61
Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	3,110	2,627
U.S. | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2,286	1,769
U.S. | U.S. | Company's Own Stock [Member]
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	4	6
U.S. | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2,286	1,769
U.S. | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
U.S. | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
U.S. | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
U.S. | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	443	471
U.S. | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	443	471
U.S. | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
U.S. | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
U.S. | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
International | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1	1	1
International | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2,211	1,958
International | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2,210	1,958
International | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
International | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1	0
International | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
International | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	373	422
International | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	373	421
International | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
International | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	1
International | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Collective Trusts/Mutual Funds | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,107	1,079
Collective Trusts/Mutual Funds | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	48	52
Collective Trusts/Mutual Funds | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Collective Trusts/Mutual Funds | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Collective Trusts/Mutual Funds | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,059	1,027
Collective Trusts/Mutual Funds | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	192	184
Collective Trusts/Mutual Funds | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	7	6
Collective Trusts/Mutual Funds | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Collective Trusts/Mutual Funds | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Collective Trusts/Mutual Funds | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	185	178
Government | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	231	523
Government | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Government | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	231	523
Government | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Government | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Government | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	240	265
Government | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	125	144
Government | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	115	121
Government | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Government | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Corporate | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	3	21
Corporate | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	778	1,444
Corporate | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Corporate | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	778	1,444
Corporate | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Corporate | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Corporate | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	578	493
Corporate | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	10	0
Corporate | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	568	490
Corporate | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	3
Corporate | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Bank Loans | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2	7	5
Bank Loans | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	129	120
Bank Loans | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Bank Loans | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	127	113
Bank Loans | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2	7
Bank Loans | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Bank Loans | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Bank Loans | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Bank Loans | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Bank Loans | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Bank Loans | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mortgage/Asset Backed | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1	1
Mortgage/Asset Backed | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mortgage/Asset Backed | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1	1
Mortgage/Asset Backed | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mortgage/Asset Backed | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mortgage/Asset Backed | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	4	4
Mortgage/Asset Backed | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mortgage/Asset Backed | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	4	4
Mortgage/Asset Backed | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mortgage/Asset Backed | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Collective Trusts/Mutual Funds | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,901	963
Collective Trusts/Mutual Funds | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	13	0
Collective Trusts/Mutual Funds | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Collective Trusts/Mutual Funds | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Collective Trusts/Mutual Funds | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,888	963
Collective Trusts/Mutual Funds | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2,520	2,230
Collective Trusts/Mutual Funds | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	4	5
Collective Trusts/Mutual Funds | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Collective Trusts/Mutual Funds | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Collective Trusts/Mutual Funds | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2,516	2,225
Mixed Funds | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mixed Funds | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mixed Funds | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mixed Funds | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mixed Funds | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mixed Funds | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	127	84
Mixed Funds | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	38	7
Mixed Funds | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	89	77
Mixed Funds | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Mixed Funds | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Real Estate | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	45	55	56
Real Estate | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,018	1,089
Real Estate | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Real Estate | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Real Estate | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Real Estate | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,018	1,089
Real Estate | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	448	277
Real Estate | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Real Estate | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Real Estate | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	45	55
Real Estate | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	403	222
Alternative Investments | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	924
Alternative Investments | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Alternative Investments | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Alternative Investments | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Alternative Investments | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	924
Alternative Investments | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Alternative Investments | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Alternative Investments | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Alternative Investments | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Alternative Investments | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Cash and Cash Equivalents | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	221	235
Cash and Cash Equivalents | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	209	228
Cash and Cash Equivalents | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	12	7
Cash and Cash Equivalents | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Cash and Cash Equivalents | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Cash and Cash Equivalents | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	417	338
Cash and Cash Equivalents | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	408	334
Cash and Cash Equivalents | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	3	2
Cash and Cash Equivalents | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Cash and Cash Equivalents | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	6	2
Other | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	45	46	$ 46
Other | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	47	72
Other | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	(19)	(5)
Other | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	22	29
Other | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	41	44
Other | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	3	4
Other | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	21	23
Other | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	(2)	0
Other | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	19	21
Other | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	4	2
Other | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	$ 0	$ 0

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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