Leases - Additional Information Related to Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 325
Operating cash flows from finance leases	24
Financing cash flows from finance leases	57
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	365
Finance leases	$ 50
Weighted-average remaining lease term:
Operating leases	10 years 8 months 12 days
Finance leases	6 years 1 month 6 days
Weighted-average discount rate:
Operating leases	3.00%
Finance leases	8.00%