Revenue Recognition - (Details) - Market-Based Businesses $ in Millions |
Dec. 31, 2019
USD ($)
|
|---|---|
| U.S. Government | |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | |
| Revenue, remaining performance obligation, amount | $ 5,400 |
| Municipalities and Commercial | |
| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | |
| Revenue, remaining performance obligation, amount | $ 547 |