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Employee Benefit Plans (Details 6) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | $ 9,948 | $ 9,550 | $ 10,274
NAV | 4,322 | 4,470 |
U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 3,663 | 3,297 |
U.S. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,909 | 1,730 |
U.S. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 54 | 53 |
Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 4,766 | 4,174 | $ 4,109
NAV | 1,966 | 1,718 |
Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,799 | 1,548 |
Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 912 | 827 |
Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 89 | 81 |
U.S. | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,331 | 1,217 |
Investment in company's common stock | 12 | 12 |
U.S. | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,331 | 1,217 |
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. | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 652 | 565 |
U.S. | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 651 | 564 |
U.S. | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1 | 1 |
U.S. | Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 0 | 0 |
International | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 2,060 | 1,832 |
International | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 2,057 | 1,822 |
International | U.S. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 3 | 10 |
International | U.S. | Level 3 |  |  |
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 | 691 | 576 |
International | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 691 | 576 |
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 | 0 |
Collective Trusts/Mutual Funds | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,089 | 1,132 |
NAV | 1,067 | 1,108 |
Collective Trusts/Mutual Funds | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 22 | 24 |
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 | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 204 | 196 |
NAV | 181 | 186 |
Collective Trusts/Mutual Funds | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 19 | 8 |
Collective Trusts/Mutual Funds | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 4 | 2 |
Collective Trusts/Mutual Funds | Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 0 | 0 |
Government | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 274 | 222 |
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 | 274 | 222 |
Government | U.S. | Level 3 |  |  |
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 | 296 | 286 |
Government | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 77 | 51 |
Government | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 219 | 235 |
Government | Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 0 | 0 |
Corporate | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,492 | 1,356 |
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 | 1,492 | 1,356 |
Corporate | U.S. | Level 3 |  |  |
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 | 593 | 509 |
Corporate | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 0 | 22 |
Corporate | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 563 | 468 |
Corporate | Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 30 | 19 |
Bank Loans | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 117 | 118 |
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 | 106 | 107 |
Bank Loans | U.S. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 11 | 11 |
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 |
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 | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 8 | 10 |
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 | 8 | 10 |
Mortgage/Asset Backed | Int’l. | 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 Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,130 | 1,031 |
NAV | 1,130 | 1,031 |
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 | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,481 | 1,278 |
NAV | 1,465 | 1,261 |
Collective Trusts/Mutual Funds | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 0 | 0 |
Collective Trusts/Mutual Funds | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 16 | 17 |
Collective Trusts/Mutual Funds | Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 0 | 0 |
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 | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 80 | 72 |
Mixed Funds | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1 | 2 |
Mixed Funds | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 79 | 70 |
Mixed Funds | Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 0 | 0 |
Real Estate | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,096 | 1,367 |
NAV | 1,096 | 1,367 |
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 | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 376 | 331 |
NAV | 320 | 271 |
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 | 60 |
Alternative Investments | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 1,022 | 955 |
NAV | 1,022 | 955 |
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 | 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 |
Cash and Cash Equivalents | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 260 | 252 |
Cash and Cash Equivalents | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 255 | 243 |
Cash and Cash Equivalents | U.S. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 5 | 9 |
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 | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 366 | 331 |
Cash and Cash Equivalents | Int’l. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 362 | 325 |
Cash and Cash Equivalents | Int’l. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 4 | 6 |
Cash and Cash Equivalents | Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 0 | 0 |
Other | U.S. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 76 | 67 |
NAV | 7 | 9 |
Other | U.S. | Level 1 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | (2) | (9) |
Other | U.S. | Level 2 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 28 | 25 |
Other | U.S. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 43 | 42 |
Other | Int’l. |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | 19 | 20 |
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 | 18 | 18 |
Other | Int’l. | Level 3 |  |  |
Fair Value Measurements of Company's Pension Plans |  |  |
Fair value of plan assets | $ 3 | $ 2 |

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