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Accumulated Other Comprehensive Income (Loss) (Income (Expense) Effect of Reclassifications) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Affected Line Item on the Statements of Income |  |  |
Interest Expense | $ (901) | $ (888) | $ (871)
Other Income (Expense) - net | (255) | 390 | 108
Total Pre-tax | 1,912 | 2,550 | 2,068
Income Taxes | (784) | (648) | (465)
Total After-Tax | 1,128 | 1,902 | 1,603
Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Total After-Tax | (205) | (30) | (145)
Available For Sale Securities [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Other Income (Expense) - net | 0 | 0 | 4
Total Pre-tax | 0 | 0 | 4
Income Taxes | 0 | 0 | (2)
Total After-Tax | 0 | 0 | 2
Qualifying Derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Total Pre-tax | (91) | 112 | (17)
Income Taxes | 18 | (21) | 15
Total After-Tax | (73) | 91 | (2)
Qualifying Derivatives [Member] | Interest Rate Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Interest Expense | (9) | (7) | (11)
Discontinued operations | 0 | 0 | (77)
Qualifying Derivatives [Member] | Cross Currency Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Interest Expense | 0 | 3 | 2
Other Income (Expense) - net | (82) | 116 | 49
Qualifying Derivatives [Member] | Commodity Contracts [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Discontinued operations | 0 | 0 | 20
Equity Investees AOCI [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Other Income (Expense) - net | (1) | 1 | 1
Total Pre-tax | (1) | 1 | 1
Income Taxes | 0 | 0 | 0
Total After-Tax | (1) | 1 | 1
Defined Benefit Plans [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Total Pre-tax | (169) | (158) | (192)
Income Taxes | 38 | 36 | 46
Total After-Tax | (131) | (122) | (146)
Defined Benefit Plans [Member] | Prior Service Costs [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Total Pre-tax | (2) | (2) | 0
Defined Benefit Plans [Member] | Net Actuarial Loss [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Total Pre-tax | $ (167) | $ (156) | $ (192)

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