Accumulated Other Comprehensive Loss, Excluding Noncontrolling Interests - Narrative (Details) $ in Millions |
12 Months Ended |
|---|---|
|
Dec. 31, 2018
USD ($)
| |
| Derivative Financial Instruments [Member] | |
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |
| Gain (loss) to be reclassified in next twelve months | $ 258 |
| Actuarial Gains/(Losses) [Member] | |
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |
| Gain (loss) to be reclassified in next twelve months | (242) |
| Prior Service (Costs)/Credits and Other [Member] | |
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |
| Gain (loss) to be reclassified in next twelve months | $ 186 |