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Lease Accounting Lessor Accounting (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Leases [Abstract]  
Rental Income, Nonoperating $ 149
Lessor, Operating Lease, Payments to be Received, Next Twelve Months 138
Lessor, Operating Lease, Payments to be Received, Two Years 112
Lessor, Operating Lease, Payments to be Received, Three Years 75
Lessor, Operating Lease, Payments to be Received, Four Years 20
Lessor, Operating Lease, Payments to be Received, Five Years 15
Lessor, Operating Lease, Payments to be Received, Thereafter 12
Lessor, Operating Lease, Payments to be Received $ 372