Commitments And Contingencies Commitments and Contingencies (Schedule of Minimum Commitments) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Firm Commitments
2021	$ 577
2022	527
2023	453
2024	478
2025	436
Thereafter	1,833
Total minimum firm commitments	$ 4,304

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant