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Employee Benefit Plans - Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets $ 129 $ 143 $ 134
U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 8,532 9,948  
U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 2,965 3,663  
U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,758 1,909  
U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 49 54  
U.S. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 3,760 4,322  
Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 4,142 4,766  
Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,441 1,799  
Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 642 912  
Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 80 89  
Int’l. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,979 1,966  
U.S. | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,110 1,331  
U.S. | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,110 1,331  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 520 652  
U.S. | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 520 651  
U.S. | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 1  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 0 0
International | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,631 2,060  
International | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,630 2,057  
International | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1 3  
International | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
International | U.S. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 521 691  
International | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 520 691  
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 0  
International | Int’l. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 893 1,089  
Collective Trusts/Mutual Funds | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 21 22  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 872 1,067  
Collective Trusts/Mutual Funds | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 152 204  
Collective Trusts/Mutual Funds | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 9 19  
Collective Trusts/Mutual Funds | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 4  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 143 181  
Government | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 225 274  
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 225 274  
Government | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Government | U.S. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 254 296  
Government | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 97 77  
Government | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 157 219  
Government | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Government | Int’l. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 21 30 19
Corporate | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,382 1,492  
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 1,382 1,492  
Corporate | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Corporate | U.S. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 409 593  
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 389 563  
Corporate | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 20 30  
Corporate | Int’l. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 5 11 11
Bank Loans | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 119 117  
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 114 106  
Bank Loans | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 5 11  
Bank Loans | U.S. | Fair Value Measured at Net Asset Value Per Share [Member]      
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 6 8  
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 6 8  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 877 1,130  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 877 1,130  
Collective Trusts/Mutual Funds | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,521 1,481  
Collective Trusts/Mutual Funds | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 15 0  
Collective Trusts/Mutual Funds | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 16  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,506 1,465  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 74 80  
Mixed Funds | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 3 1  
Mixed Funds | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 71 79  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 56 56 60
Real Estate | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,065 1,096  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 1,065 1,096  
Real Estate | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 378 376  
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 56 56  
Real Estate | Int’l. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 322 320  
Alternative Investments | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 941 1,022  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 941 1,022  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 212 260  
Cash and Cash Equivalents | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 208 255  
Cash and Cash Equivalents | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 4 5  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
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 287 366  
Cash and Cash Equivalents | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 277 362  
Cash and Cash Equivalents | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 2 4  
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. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 8 0  
Other | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 46 46 $ 44
Other | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 76 76  
Other | U.S. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets (4) (2)  
Other | U.S. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 31 28  
Other | U.S. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 44 43  
Other | U.S. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 5 7  
Other | Int’l.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 20 19  
Other | Int’l. | Level 1      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 (2)  
Other | Int’l. | Level 2      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 17 18  
Other | Int’l. | Level 3      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 3 3  
Other | Int’l. | Fair Value Measured at Net Asset Value Per Share [Member]      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets 0 0  
Defined Benefit Plan, Equity Securities, Common Stock [Member] | U.S.      
Fair Value Measurements of Company's Pension Plans      
Fair value of plan assets $ 9 $ 12