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Operating Leases - (Maturities of Operating Leases) (Details) $ in Millions	Mar. 31, 2019 USD ($)
Leases [Abstract]
2019 remaining period	$ 89
2020	110
2021	87
2022	59
2023	43
Thereafter	108
Total lease payments	496
Less: Imputed interest	(51)
Total operating lease liabilities	$ 445

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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+ References

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Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.

+ References

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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