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Accumulated Other Comprehensive Income (Loss) (Income (Expense) Effect of Reclassifications) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Affected Line Item on the Statements of Income |  |  |
Interest Expense | $ (963) | $ (901) | $ (888)
Other Income (Expense) - net | 396 | (88) | 502
Total Pre-tax | 2,285 | 1,912 | 2,550
Income Taxes | (458) | (784) | (648)
Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Total After-Tax | (115) | (205) | (30)
Qualifying Derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Total Pre-tax | 35 | (91) | 112
Income Taxes | (6) | 18 | (21)
Total After-Tax | 29 | (73) | 91
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 | (8) | (9) | (7)
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 | 1 | 0 | 3
Other Income (Expense) - net | 42 | (82) | 116
Equity Investees AOCI [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member] |  |  |
Affected Line Item on the Statements of Income |  |  |
Other Income (Expense) - net | 0 | (1) | 1
Total Pre-tax | 0 | (1) | 1
Income Taxes | 0 | 0 | 0
Total After-Tax | 0 | (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 | (180) | (169) | (158)
Income Taxes | 36 | 38 | 36
Total After-Tax | (144) | (131) | (122)
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) | (2)
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 | $ (178) | $ (167) | $ (156)

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