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Accounting Standards Updates (Details) - USD ($) $ in Millions	Jan. 01, 2019	Dec. 31, 2019
Recently issued accounting standards
Lease, Practical Expedients, Package [true false]	true
Finance Lease, Liability		$ 479
Finance lease current		35
Finance lease noncurrent		444
Operating lease liability		129
Operating leases current		13
Operating leases noncurrent		$ 116
ASU-Leases | Reclassifications
Recently issued accounting standards
Right-to-use asset, Finance lease	$ 528
Finance Lease, Liability	511
Finance lease current	32
Finance lease noncurrent	479
Right-to-use asset, Operating lease	95
Operating lease liability	133
Operating leases current	15
Operating leases noncurrent	118
ASU-Reclassification of certain tax effects | Reclassifications
Recently issued accounting standards
Effect of adopting accounting standards update	$ 24

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