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Employee Benefit Plans - Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	$ 112	$ 129	$ 143
U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	10,177	8,532
U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	4,002	2,965
U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2,117	1,758
U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	51	49
U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	4,007	3,760
Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	4,791	4,142
Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,388	1,441
Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	715	642
Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	61	80
Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2,627	1,979
U.S. | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,769	1,110
U.S. | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,769	1,110
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	471	520
U.S. | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	471	520
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	0
International | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,958	1,631
International | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,958	1,630
International | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	1
International | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	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	422	521
International | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	421	520
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	1	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	1,079	893
Collective Trusts/Mutual Funds | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	52	21
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	1,027	872
Collective Trusts/Mutual Funds | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	184	152
Collective Trusts/Mutual Funds | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	6	9
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	178	143
Government | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	523	225
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	523	225
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	265	254
Government | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	144	97
Government | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	121	157
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	3	21	30
Corporate | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,444	1,382
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	1,444	1,382
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	493	409
Corporate | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Corporate | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	490	389
Corporate | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	3	20
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	7	5	11
Bank Loans | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	120	119
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	113	114
Bank Loans | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	7	5
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	6
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	6
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	963	877
Collective Trusts/Mutual Funds | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	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	963	877
Collective Trusts/Mutual Funds | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2,230	1,521
Collective Trusts/Mutual Funds | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	5	15
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	2,225	1,506
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	84	74
Mixed Funds | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	7	3
Mixed Funds | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	77	71
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	55	56	56
Real Estate | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	1,089	1,065
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	1,089	1,065
Real Estate | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	277	378
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	55	56
Real Estate | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	222	322
Alternative Investments | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	924	941
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	924	941
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	235	212
Cash and Cash Equivalents | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	228	208
Cash and Cash Equivalents | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	7	4
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	338	287
Cash and Cash Equivalents | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	334	277
Cash and Cash Equivalents | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2	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	2	8
Other | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	46	46	$ 46
Other | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	72	76
Other | U.S. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	(5)	(4)
Other | U.S. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	29	31
Other | U.S. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	44	44
Other | U.S. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	4	5
Other | Int’l.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	23	20
Other | Int’l. | Level 1
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Other | Int’l. | Level 2
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	21	17
Other | Int’l. | Level 3
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	2	3
Other | Int’l. | NAV
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	0	0
Equity Securities, Common Stock | U.S.
Fair Value Measurements of Company's Pension Plans
Fair value of plan assets	$ 6	$ 9

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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