XML 205 R145.htm IDEA: XBRL DOCUMENT v3.10.0.1
Long-Term Debt - Scheduled Principal Payments on Long-Term Debt (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]  
2019 $ 2,262
2020 2,694
2021 3,094
2022 1,469
2023 456
All subsequent years 3,757
Key [Member]  
Debt Instrument [Line Items]  
2019 0
2020 1,298
2021 1,350
2022 0
2023 0
All subsequent years 1,752
Subsidiaries [Member]  
Debt Instrument [Line Items]  
2019 2,262
2020 1,396
2021 1,744
2022 1,469
2023 456
All subsequent years $ 2,005