XML 55 R41.htm IDEA: XBRL DOCUMENT v3.21.2
Fair Value Measurements Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Fair Value Measurements [Abstract]    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net $ 0  
Debt obligations, fair value 52,320 $ 56,210
Long-term Debt $ 46,290 $ 51,440