Financial Instruments and Fair Value Measures - Transfers of Assets or Liabilities Into or Out of Level 3 of the Fair Value Hierarchy (Details) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Transfers of assets or liabilities between the fair value measurement levels | ||
| Transfers of assets into Level 3 of the fair value hierarchy | $ 0 | |
| Transfers of assets out of Level 3 of the fair value hierarchy | 0 | |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract] | ||
| Transfers of liabilities into Level 3 of the fair value hierarchy | 0 | |
| Transfers of liabilities out of Level 3 of the fair value hierarchy | 0 | |
| Reconciliation of the fair value measurements that use significant unobservable inputs (Level 3) | ||
| Beginning balance | 7,340,000,000 | $ 4,483,000,000 |
| Change in fair value recognized in net earnings | (72,000,000) | (169,000,000) |
| Payments | (53,000,000) | 0 |
| Ending balance | $ 7,359,000,000 | $ 4,652,000,000 |